Incorrect monthly premiums

My installment increased by almost R200. 00 this month and I called Multichoice and spoke to Mbalenhle who confirmed that their system uploads incorrect amount which is what happened to my account last month. So I am supposed to be penalized for their company's error as a consumer? This is completely nonsense and apologizing to comstomers without fixing your system means you don't care at all. I use their app to pay and I pay what is dues as per the app, it's very wrong to expect to pay more than what you said I owe.