Really bad service

Since the 12th March I have been trying to change of ownership on 2 decoders. You are advised to complete the forms on line and send them trough. For this you get a case number, but no one ever follows up. Today, nearly 7 months later, my patience has run out. I am owed R1147.67 and for some reason the debit order for August was not run on my account. Now they want me to pay R1478.00, which I refuse to do until the amount owing to me is resolved. So what they are not doing is disconnecting my services every 3 days, which results in me having to call and tell the same story every time I call and possibly resulting in re connection fees as well. This service provider is costing me a lot of money for NO service