Customers of Amigo Loans who feel they were sold unaffordable guarantor loans have until November 26 to make a claim.
Amigo Loans was set up in 2005 and lent at interest rates of up to 49.9%.
Its guarantor loans meant people with poor credit could borrow, provided a family member or friend agreed to make repayments if they could not.
Amigo customers can bring claims against the lender if they think they took out such a loan.
But they only have two more days to do so.
Sara Williams, of DebtCamel, said: "A lot of people are unsure if a loan will be classified as unaffordable as they made every payment on time.
"But many people struggled to do this with Amigo Loans to protect their guarantor."
She continued: "The regulator says a loan is unaffordable if you could only repay it by borrowing more elsewhere or getting behind with bills - just paying the loan doesn't mean it was affordable.
"So if repaying Amigo was hard, make a claim to the Amigo Scheme, as you may be able to get a refund.
"With the deadline for making claim being November 26, do this today! Don't delay or it will be too late."
However, customers are unlikely to get the full value of any redress back.
Amigo has said successful claimants can expect to get 41p out of every £1 they are owed, but this figure will vary.
This lower payout was agreed in a deal with customers and the courts that led to something called the 'scheme of arrangement'.
The point of this scheme is to let customers get something rather than nothing.
Amigo argued it could not afford to keep paying out full claims without running out of cash.
How to make a claim
You can make a claim through the Amigo website here.
Amigo says claims can be brought if:
- You were a borrower and the loan(s) were not affordable for you;
- You were a guarantor who made payments towards a loan, or are still liable for a loan, that was not affordable or you were not able to afford to make payments under the guarantee
- If you have any other claim in relation to an Amigo loan
Crucially, you should avoid using a claims management firm, which can charge you as much as 30% of your payout for their service.
When claiming, you can give evidence that Amigo should not have lent to you.
Amigo asks for documents such as bank and medical statements to help build your case.
The Amigo claims website says: "While you are not required to provide documentation, we believe that your claim is more likely to be successful if you have sufficient evidence to support it."