Manager bad attitude

Today 13/11/2017 i went to McDonalds in Kathu to purchase lunch, after i placed the order for a chicken burger with chips and cold drink combo for R55 they charged me R56. It was advertised on there display for R55. The manager came to me after i complained and said to me his prizes are always correct. I told him to go outside and have a look for himself. He came back and said to me i must have a look at the correct signs i was looking at the wrong 1!!!!!!!! Imagine if McDonalds take R1 from each of us how many are they actually *****ing from us. The name of the manager was Godfrey, there was no surname on his name tag. after it all he said i MUST pay cash because he cannot swipe my card for a small amount of R55. What ignorance was that? Before i left i told him i will lay a complaint against him and he rep**** i can do whatever i want. I never had good service at this McDonalds and as far as i can help it they will never see me again and i will advertise there bad name all over social media