I just came back from Mexico where I had a weird problem that CS couldn’t explain. I tried to pay by chip and pin at a restaurant called La Coyoacana, but it declined. I tried again and it declined again. So I paid in cash.
But the transactions didn’t reverse. CS reversed one, but the restaurant presented and my account was debited.
So now I’ve paid three times: twice on my Monzo card and once in cash.
I don’t understand how they did that if the chip and pin machine said it was declined. Here’s a photo: