Got a double decline using Monzo card in the co-op supermarket on Bradford road in Birkenshaw this evening. First decline was contactless and the second chip and pin. Interestingly one of them appeared in the app as a payment and then a refund. The other one didn’t appear at all. Used the card there several times with no issues. Had to resort to my Barclays debit card (very depresssing)
Can you contact support and see what’s causing it? Then report back here. Just gives us something to go by.
Feedback from Monzo support below. Guessing it was a device issue in-store or maybe a timeout reporting as a decline (I’m assuming my debit card would have fallen back to an off-line transaction if it timed-out). Working fine elsewhere so feels store specific. Will no doubt try in the same store over the weekend so see if its a one off