Disgusting and ridiculous service, like a common ******** - less than human

Absolutely appalling and disgusting service. I just went to buy a meal from Burger King Park Station at 13.13, serviced by 495 Ntombizo. I paid for my meal in cash, mind you I buy from the same place almost every other day as it across from my work so it's convenient. I usually pay either card or cash. So the cashier gasped at one of R20 notes I gave her as it was alittle less clean and I had received it from the atm myself in that state. She doesn't say anything to me and rather embarrass me. She then called her manager, still not notifying me of whats going on or what is wrong she doesn't say anything but shows her the note. Even the manager is puzzled and asks her what she again just looks at note and looks at her manager. Stil nothing is told to me as to whats the problem. Her manger takes the money to go check it. We stand in silence for about 10 mins, no food given to me no change was given nor my slip confirming my order. She still hant explained anything and just standing there. Her boss eventually comes back and confirms money note is valid. She proceeds to give me my slip and change. No apology no explanation nothing. This is unacceptable and disgusting im taken to be a ******** with **** money and dismissed with no explanation nor an apology for wasting my time or even an acknowledgement of a process just to verify. No common courtesy or even basic manner let along. Customer service. That is disgusting totally and utterly disgusting!!!