Burger King review: customer service

Lately, the few times I have gone to a fast food place, like McDonald's, Wendy's, Culvers etc, I have noticed that they have treated me overly nice with a smile and very courteous when asking me what I needed and how could they help me. I remember thinking that fast food managers were stepping it up and were really training their staff to make sure the customers come back.
Unfortunately, this was not the case this morning.
I Went through the drive through of a Burger King today 8/12/19 at 9am. The lady taking my order over the speakerphone stated that she could not understand me and to come to the window. When I drove up to the window, she looked at us ( my friend and I) like if we had "2 heads", looking at us almost like saying: what the heck are you doing at my window? It took her a few seconds to open the window after she was looking at us through the window, to then open the window and immediately asking us, you want one bacon and one sausage? To what I said: Yes. She charged us and we gave her a 5 dollar bill and my friend said I have the change for you, yet she closed the window. My friend tried to get her attention by screaming over the closed window and then honking the horn to give her the change, but she never acknowledged us. She then opened the window to give us the change in coins, to what my friend said to her that she had the exact change for her and that we tried to get her attention, but she never acknowledged us. The lady got upset, and with an attitude took the change and went up to what I believe was the manager or team leader to get the key to put in cash register and give us the 1 dollar bill. She then give us the food and my friend immediately asked her for ketchup, yet again she did not wait to immediately close the window, before listening to what we needed. We called her, hunk the horn and the other lady inside had to tell her that we were still at the window and so she opened the window. At that point my friend said to her: Did you get up in a bad mood today? With an attitude, the lady extended her hand to give us the ketchup, and my friend said thank you and have a good day. My friend was ticked off at her lack of good customer service and said, after I told her that I was going to make a complaint, she knows she did wrong because she did not even give us food receipt where her name would have been.
I feel that whenever you deal with customers that are paying for a service or a product, you being the one receiving the money has to make sure to provide us with the best service as if it was the last possible day to get it right. This lady was obviously either not happy with her job or with us - 2 Hispanic ladies trying to get breakfast. I believe BK managers need to do a much stronger Customer Service training...so far many stores are closing, and you don't want to be one of them, or do you? Thank you!