DSTV - Deducts money out of my account by mistake!!!!

DSTV deducted my R3025 from account - as they though i was in arrears - however i have a debit order with them??? in addition to that - they charge me for a smart card that i deactived over 6 months ago. Yet they refuse to refund me for a sim card that i do not have , they said they will escalate this issue - but thats it!!!!!! terrible terrible service and near impossible to get hold of anybody to speak to , and when you do , they have absolutely no mandate or knowledge to resolve anything