Just canvassing opinion really. (this is a boring aibu)
Today in one of the big supermarkets I noticed on my receipt that once again I'd not received the discount on a 2 for X promotion, the difference was 38p, now this has happened to me so many times in this store, I usually realise when I'm home. So I'd got to the door and thought 'no, I'm going to tell them' so I queued at the service desk and explained that id not received my discount. The person on the desk said 'oh yeah that offers finished, but the sticker is still on, do you want the 38p back then?' I said yes please and got my money back. All good.
But now I'm thinking I probably looked a bit tight, how much is too little to ask to get back If you've been over charged?