A furious motorist says he was fined £100 for parking his car for 23 hours when in reality he was only there for 30 minutes.
Banker Lawrence Carnie says faulty cameras are to blame and claims hundreds of similar errors have been made.
Mr Carnie said he visited a retail park two days in a row for 30-minute stints, but was punished thanks to problems with the CCTV.
The car park is free for three hours but he claims he was never logged leaving the first time so was hit with a fine for overstaying.
But now the 58-year-old says his detective work unveiled a catalogue of mistakes in the parking company's records.
Having looked through reams of data and making use of his skills as an analyst, Mr Carnie now thinks that he might not be the only one getting fined unfairly by the parking company’s automatic camera system.
He appealed after being given a parking fine of £100, but it was rejected by parking enforcers, Group Nexus.
The Tower Retail Park car park in Dartford, Kent, that issued the fine on June 10 has a maximum stay of three hours.
Mr Carnie stayed for 30 minutes one day when he went to buy a TV, then returned the next day for another half-an-hour, he said.
But 10 days later he received a fine of £100 for allegedly staying in the car park for 23 hours.
After carrying out some detective work, Mr Carnie claims he has found hundreds of "errors" in the records of the parking company and discovered he may not be the only one getting unfairly fined.
By appealing the penalty through the independent adjudicators, Popla, Group Nexus released a 356-page document showing all activity across that 24-hour period at the Dartford car park in Kent.
Mr Carnie used his knowledge of analytics and placed all the logs into a spreadsheet.
From there he deduced that Group Nexus' data appeared to be missing a number of entries.
According to the document, Mr Carnie was spotted entering the shopping estate car park at 3.20pm on June 10.
He was then seen leaving at 1.30pm the next day with no other data entries for his car.
After looking through all 9,920 entries, he claims there are even more anomalies.
Mr Carnie noticed that 135 cars arrived or left the car park twice, while 67 entered two times and 68 vehicles left twice.
There was also a single entry where one car exited the car park three times without even entering.
Along with this, Mr Carnie discovered that 96 cars were recorded going in on June 10, but were not spotted leaving that day.
On June 11, 100 different cars, that hadn't arrived that day, were seen leaving - meaning a maximum of 196 people would also have been fined.
Mr Carnie said: "That one night they had 196 cars left unchecked meaning at 3am that car park should've been half full."
He added: "I'm almost on a bit of a crusade at this point. I've given up on ranting about my fine because I feel I've got them.
"How can they be issuing fines off of this? Their data is so bad. What I really want is for Group Nexus to cancel all their parking fines from this car park."
His appeal is still pending a verdict but Mr Carnie is confident the adjudicators will vote in his favour.
When asked to make a comment Group Nexus said: "This case concerns an appeal we have already received and responded to.
"The challenge was rejected and the PCN upheld on the grounds that the motorist overstayed the free time allocation.
"Issues with the cameras are extremely rare. When there is one, we virtually always find evidence of it on the system.
"In this case we investigated the claim and could find no evidence that this vehicle had visited the site twice.
"This case is now with the independent adjudicator."
If the appeal is successful, it could have implications for all other fines Group Nexus have issued at the car park.
