McDonald’s complaint: Manager!!

I visit this McDonald’s several times a week with my family. Today I went there and ordered 4 meals. I noticed on the receipt that I was overcharged for a large drink, that I did not order, because I wanted a Large Caramel Frappe and it just would have been an upcharge. The cashier tried to handle it but another employee stepped in and said the computer automatically does that. I told him that was not correct but he insisted that if he wrung up five meals it would do the same thing. I told him again that was not correct. I had four orders on my ticket and if he looked at it, he would see that was not correct!. He said he would get a manager to handle it, A young white girl came up to the counter and was going to issue the refund. I said to her maybe employees should not say things if they don’t know what they are talking about. She preceded to tell me that I was being rude and he was a new employee. I said again that if that’s true then he should not be telling customers something that is incorrect. She then REFUSED to refund me my money for the drink, told me I had to take the drink and have a nice day. I told her I didn’t order the drink and wanted my money back. She again REFUSED and told me to have a nice day. If I had not taken the cup I would have lost my money. I asked her what her name was and she REFUSED to give it to me and repeated again to have a nice day and walked away!

I could see if I was yelling and saying stuff to the employee. She could barely here what I said so it was not like I was being loud. But if employees are not trained, they should not be disputing the customer especially since two of the other orders on the bill was the same way so the computer does not do it automatically.