MBNA app instant update

I paid £30 for goods using my MBNA contactless card this afternoon. The card terminal was happy with the transaction, it beeped and showed 'approved' on the screen. However, the stores till displayed a 'please wait' message. So.....we waited. One minute....two minutes....three.......five.......queue building up. A supervisor was called who made it quite clear, so that everyone in the shop could hear, that the transaction had not gone through and I would have to pay again, at a different till. His attitude really got up my nose. I told him that the terminal had authorised the transaction and the hold up was down to the store's equipment, but he was having none of it and said, if I didn't pay again, I wasn't taking the goods.
I quickly logged on to the app and saw the transaction there as pending. So, milking it, I shoved the phone in his face and told him that perhaps his company should arrange a training day so that the supervisors understood how these things work, so as to serve customers better. He didn't apologise, but there was no need, the look he was getting from the queue was enough for me. :T