No Feedback on incorrect debit order service

I was a premium DSTV subscriber. I changed my subscription to Easyview on the self-help web site. Active 31/03. My decoder was off most of April and May. Multichoice collected a DO for 2 months worth (1439.00) of premium subscription on 04/05. I contacted them and sent a screen-shot of change (13/05) after disputing the DO. I was given an outstanding amount which I paid immediately (238.00). I was promised it would be corrected. The following month they collected another DO (902.00). I disputed it again and contacted them again (03/06). I again sent the screen-shot and was told issue was escalated. I received confirmation of my email on 03/06 I followed up 2 weeks later (18/06). No feedback since 03/06. I have cancelled my service and was contacted twice to do \Satisfaction"surveys. I need to have confirmation that I own nothing - a zero balance statement. I made use of their tools (self-help web site)"