Account still debited for cancelled subscription

We terminated our Multichoice DSTV subscription 3 months ago, but our account is still debited every month.<br> We have called the DSTV customer call centre 3 times now, every time the person we spoke to said the subscription is definitely cancelled now, but then at the end of the month the debit order goes off again. And every time it costs us money to reverse the debit order. Disgusting and pathetic service, if this is not sorted out immediately I am going to take legal action.