McDonald’s complaint: Placed a mobile order

Order was placed over my phone, got to the drive thru as I selected on my mobile app. When I got to the microphone I was told I could only pay cash for my order, due to the system being down. I said I ordered on the mobile app and its already been paid for. She told me I would have to speak to the manager. Ok will do, got the to window they handed me a bag and then a large coke. I said whats that for , she said you ordered a large coke, aww no I did not. The manager came to the window and I showed her my phone. That the order was already placed, she was very rude to me and said ok what did you order, told her. She then stated to more forward. They came out with my order which was not what I ordered missing extra onions on both my burger which I paid for. Then get this she told me that is not your bag. Well they gave me the order that wasnt mine then took it back after being in my car for over 10 minutes….gross….Good luck to the people behind me. I didnt catch her name , but she acted like it was my fault for ordering. This was at 2:00pm