Sara Hudgell ordered the charcoal Harry Right Corner Fabric Sofa from the retail giant last Monday, and was delighted when it arrived five days later on Saturday.
But the new mum's joy was short lived when her 29-year-old electrician husband Greg Hudgell tore off the wrapping and discovered each piece was a different colour.
Unwrapping the entire piece of furniture they soon discovered they'd taken delivery of the correct model but in two different colours - charcoal and beige.
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Believing it to be a simple mix-up, the 26-year-old rang the delivery driver in the hope of getting the correct half of her sofa dropped off.
But the mental health support worker's jaw dropped when the delivery driver said it wasn't a mistake and she'd have to take it up with Argos.
When Sara flagged the mismatched mistake to Argos, she claims she was told she could keep it, return it or pay to upgrade to another model but would have to pay the difference.
Sara said she was also offered an 'insulting' £30 'compensation' for their trouble and branded the whole situation 'a complete shambles'.
The mum-of-one says she's now 'stuck upstairs' and forced to nurse and care for three-week-old Arthur Hudgell on her bed, as she doesn't want to mark the sofa before it's collected.
Sara felt compelled to share the delivery dilemma on social media, posting a photo of the bizarre and partially-dented sofa - prompting some to quip that it was a 'frankensofa'.
Argos said Sara's experience did 'not meet their usual high standards' and said they have provided a full refund for the sofa and arranged for the sofa to be collected.
Sara, from Swansea, south-west Wales, said: "I'm still stuck upstairs because of this, I'm so angry.
"You couldn't make it up, it's just a complete shambles.
"The last sofa we had was just a small one we got off Facebook Marketplace just to tide us over.
"We're doing the house up and we finally got round to ordering the new sofa last Monday for delivery on Saturday.
"We've been looking for a corner sofa and chose the grey one for the colour scheme we are going for and that was in our budget.
"We ordered it on Monday and it was due to arrive on Saturday, I was looking forward to spending time downstairs.
"As we don't have the space to have two sofas in our living room we had already got rid of the other sofa and I'd spent the last couple of days sitting on the bed upstairs.
"They came about midday to deliver it. It was wrapped in cardboard and polythene so we couldn't see the colour of the sofa before they brought it into the house.
"I was upstairs with the baby. Greg unwrapped one part of the sofa and saw it was the wrong colour and shouted up to me, then he unwrapped the other half and saw it was the right colour.
"We phoned the delivery guy back and said 'we think you have made a mistake and the other half of our sofa is in your van'.
"He said it would have to go through Argos - even though it was just 20 minutes since he left.
"I felt very frustrated as he had only just left. I'm still stuck upstairs because of this, I'm so angry. You couldn't make it up, it's just a complete shambles."
Sara said after contacting Argos she was told that she had three options - keep the mis-matched sofa, exchange for another more expensive model that they would need to foot the difference for or get a refund.
If they opted to either keep or exchange they would be offered '£30 compensation'.
This situation come just a couple of weeks after they ordered a £700 range oven from Argos, only for it to arrive damaged and needing to be replaced.
Sara said: "It's just ridiculous.
"We were told we had the wrong half because the grey was out of stock and they couldn't provide the other half of the sofa we wanted.
"Apparently it was a warehouse error - and someone thought it was a good idea to send out two different-coloured sofas. It's just ridiculous.
"They could collect it and we would get a refund, but the refund wouldn't be issued until five working days after it's collected.
"They said they could collect it and exchange [for another sofa] and we pay the difference, and 'in the meantime he's £30 for your troubles'.
"We're pretty much against the money when we have had such bad service.
"The woman we spoke to said they wouldn't issue a refund until after they collect the sofa - and it would take five working days. It's being collected today [on Tuesday].
"We're quite lucky that someone has offered to let us buy different sofa from somewhere else and we can pay them back then once we get a refund.
"At the minute we're just back to an empty space with no sofa.
"I would never buy from Argos again. We both have Argos credit cards but have decided to cancel them, they're not having any more purchases from us.
"It's so appalling it's laughable. It seems like one big joke, like someone is having a laugh."
When journalists contacted Argos for comment they offered to speed up the refund for Sara and offered £50 cash.
An Argos spokesperson said: "We're in touch with Sara and Greg to apologise for their experiences, which do not meet our usual high standards.
"We have provided a full refund for the sofa as well as an additional gesture of goodwill. We're also arranging for the mismatched sofa, which was delivered in error, to be collected."
Sara's Facebook post read: "Sara's Facebook post read: "If I don't laugh...I'll cry...
"Thanks Argos for sending our new sofa in two colours because half of it was out of stock.
"Takes 'greige' to a whole new level don't you think?!
"Offer of £30 compensation more than makes up for it... NEXT JOKE PLEASE."
Social media users flooding the post with comments.
Louise Stephanie wrote: "Argos where can I buy one of these Frankenstein sofas?"
Sara Hudgell replied: "Louise Stephanie its pot luck see, sometimes you get mis-matched and sometimes items come with a dent the size of a small car in them...if you're lucky then both!!
Louise Stephanie wrote: "Ooh Russian roulette of home furnishings! A dented, mis-matched sofa sounds ideal."
El King commented: "Are you serious? I would have definitely cried."
Erin Paterson wrote: "I'm so sorry this happened...but I'm even more sorry for absolutely howling at this."
