Mcdonald's

I usually don’t have a problem preordering and picking up, but this particular McDonald’s was particularly rude and was having a hard time picking up my order. I order near by on my phone, and send it in. I went to the window that said to pick up my order, and they sent me to the cashier. I showed them my number and the cashier said,” I can’t find your order.” She was all confused, and non caring, said to call the number, and just re typed in my order and asked me to pay. I didn’t want to pay again because the app had a discount I payed and applied to. She repeatedly said, “I don’t know what to do for you” Even though I had proof I ordered from the exact store for nuggets, soda, and fries I then had to call the number, and I had to find the reciept in the email I barely used. By that time I finished, they finally found my order.