Making their fault ours

Still sad and too disappointed with what MultiChoice made me go through I paid my account last week Tuesday I even went on WhatsApp to check the outstanding balance on that very same Tuesday and I paid that 287 that was due after not being connected after paying I kept checking my balance and it was 96 something and which was due on 03rd of much all of the sudden they calling me telling me that I need to pay another money on top of that amount I paid so I want to understand if I'm the one whose running their system for it to give me a wrong amount im a customer and if the price are placed wrong that's not my fault but their's so I don't know if MultiChoice is ****ming people or what