The Interchange Fee Regulation (IFR) was introduced in June 2015 to curb charges and require card payment providers to be more transparent.

But while IFR capped bank and merchant interchange fees at 0.2% for debit cards and 0.3% for credit cards, Abta says other fees have been increased or introduced – wiping out savings to retailers.

The association’s call for evidence comes after its concerns about the cost of card payments were recognised by economic secretary to the Treasury John Glen.

Glen said the Treasury would continue to monitor the effect of IFR, adding the Payment Services Regulator (PSR) had requested Abta members report any breaches.

Mark Tanzer, Abta chief executive, said: “We’re encouraging members to share evidence of violations in order to pass on to the PSR to investigate.”

Violations include non-compliance with rates, not providing information on fees or card types when requested, and evidence of other charges within merchant service fees.

Members should send any evidence to publicaffairs@abta.co.uk.

Elsewhere, Abta has welcomed the sentencing of a couple who made a brazen false sickness claim while holidaying in Turkey with Tui.

Leon Roberts and Jade Muzoka, who said they fell ill with food poisoning at a spa resort in July 2015 before putting pictures of their trip on Facebook, were spared jail on March 5 after admitting fraud.

A Tui spokesperson said the firm would not hesitate to bring similar cases to court.

Abta’s Tanzer added action needed to be taken to stop such false claims being made in the first place. “The government must make good on its promise to bring overseas personal injury and sickness claims into the fixed legal cost regime,” he said.