Debt campaigners say the charges – which are expected to be banned next May – are designed to deter troubled punters from claiming
Payday lenders charge people in difficulty £ 10 to bring compensation claims against them.
Former customers must request a list of loans before they can claim that they have been mis-sold.
One company, Lending Stream, charges people £ 10 for a copy of their data.
Debt activists say the charges – which are expected to be banned next May – are designed to prevent troubled punters from claiming.
James Walker, of resolver.co.uk, said: “There is no excuse for deliberately putting obstacles in the way of complaints. They have the right to lodge a complaint free of charge.
Last month we revealed that some were making up to £ 22,000 in comps.
Lending Stream – which offers loans of £ 1,500 at annual rates of 1,325% – has said it complies with its “legal and regulatory requirements”.
A spokesperson added: “There is never a fee charged for making a complaint.”
Almost 800 complaints about Lending Stream have been filed with the Financial Ombudsman in the past 18 months, saying he failed to perform proper accessibility and credit checks.