Takeaway food app Just Eat is being criticised after introducing a 50p service charge on all its orders.
Previously it levied a 50p surcharge on debit and credit card payments.
But from Saturday 13 January, all card surcharges will be banned when a new European directive comes into force.
Critics say the move by Just Eat flies in the face of the new legislation, which was designed to save consumers up to £473m a year in card charges.
“It’s wrong for companies to rebrand credit card fees as service charges,” said Hannah Maundrell, the editor in chief of Money.co.uk.
“The law was changed to stop businesses from profiting from unnecessary credit and debit card fees. So this makes a mockery of the law which is trying to protect us from getting ripped off.”
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In a statement, Just Eat said it had already been considering altering the way it charges its customers.
However, it admitted that “the change to legislation did play a part in prompting the review”.
The change, which took effect on 8 January, has provoked criticism from the firm’s customers on social media.
One said the charge was “awful”, while others said they did not understand why it was being imposed.
@JustEatUK 50p "service charge" are you just blatantly trying to get rid of your customer base? Awful.
— Wardner75 (@Wardner75) January 8, 2018
— James (@takeawayboy) January 1, 2018
But Just Eat said the new system would be fairer for its customers, as those paying by cash will also have to pay the charge.
“The 50p charge simply means that along with our restaurant partners, we can continue to deliver the best possible takeaway experience, and applying the charge equally across the customer base ensures fairness for all,” a spokesperson said.
Ms Maundrell said that she expected some companies to increase their prices as a result of the new legislation, but this should be reflected in the cost of the goods themselves, to make comparisons easier.
“Being stung at the end of a transaction with a service charge isn’t fair – businesses ought to be transparent about their pricing upfront.”
Just Eat entered the list of Britain’s biggest 100 companies – the FTSE 100 – last month.