Billing at Multichoice is a joke

The billing at MultiChoice is a joke and that is why I will NEVER use a debit order to pay. Even though I have been paying R900 (or more) every month, the app and USSD currently show that I should pay R1559 by 5 Nov. I phoned the contact centre and the agent clarified that I should only pay R700,50 by 5 November. She explained that I have a credit and have been incorrectly billed for December as well! She said that this is an ongoing problem and is affecting many customers. She doesn't know if anything is being done about it. So, despite receiving invoices; having an App; having USSD and the website, I am being advised to call the contact centre EVERY MONTH if I hope to get the correct amount due. What on earth? I thought we are in 2018. I already suspect that my viewing will be disconnected in error (like it has in the past) due to a faulty billing system. If this happens, I will demand a month's free subscription because of unfair treatment. Please let me know what is being done about the billing problem and also please give me assurance that my viewing will not be suspended if I pay this R700 on time. What a joke. Surely billing issues should be the type of priority that warrants informing the contact centre about the progress??