burnt onion and bad attitude

yesterday I went 2 McDonalds drive thru to order that spicy range foldover and I was told they don't cater that in the morning, when I insist they gave me with uncooked onion, I kept quit.today morning I went again for the same meal at 5:50am, when I got to the drive thru I asked the lady what time is the breakfast starting they said 6am, I ordered they same. Rachel who suppose to be the manager came back and said they will not do it for me, when I asked why I was told that because they will not cook onion for only 1 customer I then asked if why don't they put a list of customers at the gate if they issue service by they number of customers so that we know what number it must be for us to get service, I told her that I don't care because I wanted to be treated as an important customer as I'm always buying there and the reason why Is bcoz of service. to top it all she shouted at the lady at the till simply because she agreed to assist me. then guess what when I got the mackfeast and the foldover it had burnt onion , i threw it away, so I think she was trying to get back at me lsimply because I wanted service, headooffice should set an example to franchise not be the worst