Shouted at the customer service till

i had used a pick and pay till pay point to pay my Multichoice account and was advised that the amount is not reflecting given a reference number so i can ask pick and pay to track my payments because the could have captured the reference incorrectly besides the fact that i waited 20 min to be served the lady who did instead of explaining the procedure to me shouting and pointing fingers at me when i asked to please lower her voice she said she sorry she cant because she has a loud voice i have never been so infuriated by someone she then asked for my details and said she will get back to me if she get a chance ..i have never been spoken to like that in my life and disgusted at the way customer service handled the situation .