Cancell DSTV and then they still want more money.

Poor poor service with no help if you phone the call centre. Cancelled my Dstv on the 25th of May. Got a confirmation sms and email stating that my service will be cancelled on the the 25 of July. Last debit order was then collected at the 25th of June. Now all of a sudden they say there is still an amount of R222 outstanding. How can this be possible if the debit order amount was debited by DSTV.