Unhappy dstv customer

I have a serious problem with multichoice, since i upgraded they are always over charging me and never gets back to me with responses when i contact them. They always tell me about escalating matters but i never get feedback. This month they deducted 783.15 from my account but i have a contract with them for 649 monthly. They told me my bank made a reversal last month i contacted my bank there was no record of that, even my bank statements do not show that. I contacted dstv again and informed them about this they said they will fix the amount as the matter has been escalated. I never received any feedback but today they deducted that 783.15 still. On their app its showing that amount due this month is 453.85, so why are they deducted 783.15. I tried again to make contact with them via their chat services even though they say "typically responds within 3 minutes" you wait forever to get response from them. I'm really tired of dstv and i don't know what to do anymore, they are not keeping to their end of the contract as per package chosen. I have proof of all the other times they billed me way more then the contract stipulated also. I also send an email of complained to the chat service supervisor of the details received, that person never even responded to my email or complain. They do not even deserve a single star for rating. Their service and customer care is horrible