Account incorrectly billed and bad customer service

I got a call from a DStv consultant offering me the Price Lock option which I duly accepted. I was told that this could only be via debit order payment and since I was already paying via debit order, this was not a problem to me. Ever since I accepted the Price Lock option, I've had my DStv services suspended 4 times because my account was suddenly in arrears even though my payments are via debit order. Every time my services got suspended I had to call the Call Center in an effort to resolve this. On each occasion I spoke to the Call Center agents, I was told that the matter was escalated to the relevant department to resolve. On the last occasion I spoke to the Supervisor by the name of Anthony (Pta offices) who advised that since the matter had been escalated already and because the matter had not been resolved, he'd personally go the relevant dept and phone me back to give me an update. I'm yet to hear from Anthony and the debit order went through and I was double billed. I even logged an online query on the DStv site which promised that this would be resolved within 3 days. Despite all my efforts, I was still incorrectly billed. Can DStv resolve this mess created by them and stop making false promises to their clients and sort out their billing.