I order a lot of Maccas I won't lie, love it when they do 24 nuggets for $10 mmm yes what a treat. It's happened more than a few times now though where I'd order some stuff on the app, pay, tell the cashier the code, and then they'll bring out more than I ordered.
Just this morning in the drive-thru they went to hand me a large Fanta which I apparently ordered. I said I didn't order it and she (the manager) was super quick to get me a cash refund. Seeing how quickly she handled that makes me think she's seen it a few times too.
Lo and behold I checked the order and the large Fanta had snuck itself in there. It's definitely not user error. The pay screen showed a lower price than my credit card transaction log, so something's definitely going on there.
Has this happened to you? What's your experience with the app been?
What did McDonalds say when you contacted them?