Suffering because of Multichoice's payments system error.

Dstv has switched of my service and have asked me to pay R910.00. On the 30th of June I got an sms from multichoice saying that I must pay R36.92 for the month of June, I went on my FNB app and made payment. Last week my services have been switched off twice, when I called they advised that their system shows that my account is in arrears, I asked them why is it on arrears because I paid them as they requested. The services were switched on again. Yesterday I got another sms showing an amount of R910.00 due for this mouth, I called customer services again and spoke to Thabiso until my airtime ran out and the call got cut, I notified him that I am running out of airtime. He didn't have call me back when the call got cut off. Today I called again and was advised that the payment I made in May was updated twice by twice which showed credit and that is why I only paid R36.92 for the month of June, I told the consultant that this is their systems error and not mine, I asked to speak to a manager, someone by the name of Thabiso Molefe took the call, he was not helpful at all. I asked him as the manager to rectify the amount as the manager as I will not be paying R910.00 for their system error. He didn't even bother to apologise for the error and showed no empathy but bad attitude. These absolutely no customer service in multichoice, they do not care about their customers, they do not put their customers first, As their customer they've made me feel like I do not matter.