Been charged for canceled service

My amount owed is climbing every month, the amount does not appear on the statements, I have canceled my service back in march yet DSTV seem fit to keep racking up up a bill on my profile. The only service I carry with them is an insurance fee of R35 for my decoder which I do pay for, so what costs am I carrying over??? Thank God I don't do debit order. People be warned, don't let these ******** near your bank account.