Poor Customer service

I had the worst experience of my life today at vodacom Ballito Lifestyle center, I went in to do a simple sim swap, when i got in i explained what i needed, they sat me down waiting to served yet there was 2 available people and no customers yet i waited. finally nThokozo called me up, firs words were, "You know im gonna charge you 20 bux" i said ok let me go quickly get my card out the car, his response in a sarcastic tone"you gonna get your card for 20 bux" well it should be the customers preference on how they would like to pay, most people dont carry cash around. I explained i already purchased a starter pack and just needed to sim swap my number, he looked up my details and asked me are you Kumaran Naidoo? i rep**** yes, he then had the nerve to ask me if im sure im Kumaran Naidoo, this really ****ed me off, so my response was instead of doubting a customers answer ak for my ID and verify if its the same person in the picture instead of asking a customer are you sure you are that person you are claiming to be. anyway he started opening a new starter pack so i stopped him and said i already have a starter pack i dont want a new one, he rep****"this is for my revenue" i asked him what and he rep**** "its for my revenue" this drove me off the wall but i still managed to keep my cool, I told him i dont need a new one as i already have one which i just bought, he then said "well go do your sim swap where you bought the sim card from then" this was completely humiliating as there were other customers and staff their and i live in the area and i was embarrassed in front of other people. I have never been humiliated like that before it was my worst experience ever and to think i have been a loyal customer to Vodacom for nearly 20 years, I said no problem thanks and took my stuff and he had the audacity to tell me take care, I asked him for his name and he laughed and called his name out and asked me if i need anything else. and the other staff laughed as well, I was and am emotianally distressed after being treated so badly when i was meant to be assisted, I will be taking this further