DEBIT ORDER STILL GOING OFF AFTER I REQUESTED TO BE CANCELED

I am experiencing a bad service from Cartrack. few months ago I have noticed that they debiting two different amounts on different dates then I called around June this year spoke to Katlego requesting cancellation he asked why I want to cancel and I told him that is due to the fact that they debiting different amounts on different dates, he made me to hold said he is checking as to why , I hold until he dropped my call and never got back to me. They kept on debiting my account until I called them again to find out why spoke to few ladies which they advised that there is no cancellation request that was not logged. Eventually spoke to Vuyiswa said will send request through I told her that I am willing to pay until June however not going pay after June as contract was supposed to be cancelled. I requested for call recordings for the time a spoke to Katlego she came back to me saying that they couldn't find the recording but will escalate the matter till today I am still waiting for them in the meantime they are busy trying to debit an amount that I don't where is it coming from to make matter worse, they debit order is coming back unpaid which is making unnecessary charges that I still need to pay. I also don't understand why they keep on debiting after they sent me an sms stating that I am handed over. PLEASE STOP DEBITING MY ACCOUNT