Pret a Manger in Milton Keynes

We had an unpleasant experience over a week ago at Pret a Manger Eagle Walk in The Centre:MK. We were double charged on our debit card as staff (barista and manager) insisted the first attempt was unsuccessful. It was not unsuccessful – contactless was approved but the barista had left the till to fix our drink orders and when he returned he asked for payment again. We told him we had paid and asked for a receipt. He could not print a receipt and insisted payment had not gone through so on the second attempt we inserted our debit card. Again he could not produce a receipt and a manager/supervisor was summoned. The manager was quite rude and refused to believe that payment had been approved. He was adamant that payment had not gone through and he used another till to process another payment. On this attempt we got a receipt. Upon reaching home several hours later we checked our bank account online and there were 2 payments for the one transaction. We called the outlet and requested a refund of the overcharge, either by bank transfer or a cheque to be sent to our home as we live over 25 miles away and seldom frequent their outlet . We have also contacted their Customer Service but despite several back and forths there has been no real progress. Moral of the story? Make sure the barista does not leave the till before you get your receipt. Or pay in cash.