Disgusting customer service

I'm very ****ed off with the service from multichoice. Every month I need to call them to enquire about my payment due. The SMS and self service amounts are always different. Everytime I call I get told I have more than 1 service active. I only have 1 service active. Today I spoke to 5 different agents who all gave me 5 different stories. I requested to speak to a manager and I was told the manager is not available. The 1 agent told me that I have an outstanding balance and this would need to be escalated to the finance department until than there is nothing he can do. I requested the manager again the agent went to get a manager, I requested not to be put on hold and heard the manager saying that he will not take the call as his shift only starts at 12pm. I still insisted to speak to a manager while waiting I heard the manager telling the agent that I don't owe anything on my account. The agent refused to reconnect my services I spoke to another agent who transferred me to the manager where the manager told me that multichoice owes me money and that he is not able to reconnect me due to system issues. I tried the self service and was not able to connect myself as there were no active decoders on my account. I called back explaining myself again and conveniently the agent was able to reconnect me. After all this I go in and check my balance after being told by a manager that multichoice owes me a see a bill on my account of R1580. Like seriously I'm honestly not happy with multichoice I spent over R100 airtime every month speaking to agents and managers. I am gat vol and would like to know where I can escalate this further. I've been a customer for over 10 years