ABOUT 2.5 million people have used an unauthorised overdraft in the last year.
More than two thirds say fees and charges are too high or unfair, a survey has found.
More than a third (36 per cent) were surprised by the amount charged and 68 per cent said costs were too high, according to Which?
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Nearly 25,000 people signed its Stop Sneaky Fees and Charges campaign.
Which? executive director Richard Lloyd said: "We want all banks and current account providers to stop sneaky fees and charges and end excessive, unclear unauthorised overdraft fees.''