BAD SERVICE DSTV - Multi Choice

I had issues with DSTV since last year August. After many calls and NO HELP I e-mailed them and cancelled my subscription. I then got a settlement and paid that amount. They still have a balance on my account and I cannot get this sorted out. I phoned and e-mail them but they just dont help. From September last year I cannot get this sorted our. I spoke to managers in the team and they dont even get back to me. I will never ever use DSTV again I use Netflix for R169.00 and are very happy. I refuse to pay the balance because they disconnected my service from beginning September. I tried few times to sort this out with 100 of calls but they just don't help.