In one case, it refused to refund a customer who had 10,000 fraudulently taken from her account.

With price adjustments, retailers will refund a customer the difference in cost even if the item has already been used.

It has agreed to refund customers who would have cancelled their policies and has already paid back about £96,000.

Tui had given an undertaking to refund all customers by the end of the month at an estimated cost of up to €200 million.

The travel industry has been accused of breaking the law by failing to refund customers in cash for cancelled holidays.