Poor customer service

I am writing to advise of the poor customer service I received. On Friday 28th August, I approached the drive through lane but saw a notice saying that it was closed (card facilities not working - AGAIN). So I parked outside and went to the counter to place my order. To my amazement, there was complete chaos inside the kitchens ( you can see them from t he counter. I tried to get someone's attention to get served, but to no avail. Staff shouting at the top of their voices and ignoring myself and other customers. When I did get someone's attention, the staff member gave a smirk like she thought it was funny. I asked in a loud voice where the manager was, and after a couple of minutes, the manager comes out, asked me what was wrong. I tried to explain, and her attitude to me left me fuming. Then she accused me of swearing at her and the staff?!! I raised my voice out of frustration, but I didn't swear. Lately, I have noticed that McDonalds often has the drive through closed due to \problems with their card machine"and I frequently order something"