Yes I think that must be what’s happened unfortunately, they probably bought a few gift cards at the same time as it was Christmas!
I have the physical gift card with the card number, pin and the receipt. It’s only when I went to use it that it didn’t work and that’s when I realised the number on the receipt was slightly different.
I’ve sent Tesco a message on Twitter to see if they can help and emailed the retailer directly too. Not sure if anything can be done but I don’t want to make my boyfriend’s sister feel bad by mentioning it!
Thank you for helping me! I always forget to use gift cards so it’s typical this happens when I finally remembered for once