Disgusting customer service

I had i very bad service at Mr price daveyton mall i bought junior sandles the price at the shelf was R79.99 and when I got to the till I was told that the price has changed to R89.99 i then told the cashier who was serving me that i want them for the price that i saw them with on the floor, the cashier called the person who is responsible for packing shoes by the name of Lawrance the guy was rude and disrespectful and he didn't see me as a customer he even asked me if i worked at a retail store before as if that metered and he even said am behaving like a white person am disgusted by the service i received the and that guy does not deserve to work with customers as he doesnt even know what customer service is am never going to set my feet in that store ever again.