Disgusting customer service

This McDonalds has to be LITTERALLY THE WORST McDonalds I've ever been to IN MY LIFE. The cashiers/consultants do have customer service, I do not even think they are taken for customer training. The drive thru is always packed and slow I've never taken less than 30 minutes to get my meal. when you get to the window to make payment there's no one when the person comes she/he doesn't greet they'll just take your money or card without saying word, then give you your receipt without saying anything. Can the manager train those people to greet and atleast thank customers when rendering a service, they honestly make us feel like we are bothering them or disturbing them. They not welcoming and friendly towards customers.