Complaint About Pick and Pay Cresta

on the 4th of July 2018. I went to Pick and pay Cresta to pay my DSTV account. i was on the queue, while approaching the teller named Mary. she starts shouting she doesn't have money for SASSA. I asked her what do you mean? and she repeats she doesn't have money for SASSA. I never mentioned anything about SASSA I do no have a SASSA card i have never owned one, she assumed this just by me being a black female with a card in hand. she proceeded to explain that it's the dates for SASSA assumed that I was there for that. my question is why is not just money? I spend so much money at pick n pay and to be made to feel less than because I am black is unacceptable . what if I had come in to use a SASSA CARD? How would I feel then? Pick N pay tellers can be quite rude at times and we sit and we take it we joke about it but it's unacceptable.