Something really odd happened while I was helping my DM make an online purchase today and I wondered if anyone else has had the same experience? DM was at my house and needed to order her dogs medication from her usual online supplier so we did it together (she's not very confident with online purchases) on my phone.
We logged in to her account with the supplier, uploaded the prescription and placed the order and then came to the payment page and found her card details were auto filled, which would be fine except that she had a new card a week ago and hasn't used it online, let alone with this particular website. She had reported her old card lost (she did find it in the end but had already cancelled it and ordered a new one) so it was a brand new card number and in any case she never saves card details when shopping online so they shouldn't even have had the old number, let alone the new one that she'd never used! I haven't seen her since she had the new card until today, she's never given me the card number and it's never been entered into my phone for anything so not saved on my device either.
She's rung the bank, and the supplier and both are completely baffled, as are we. As I understand it, and the bank said the same, what happened can't happen, but it did. Has this happened to anyone else, or can anyone explain how it could have happened?