Cancelled debit order

I called in the company on the 15th December requesting them to cancel my debit order for the tracker as my vehicle has been written off... I was told that I subscribed for a 3 year contract in that case I'm going to have to pay R2600 on my next debit order date which is the 20th december and I said it's fine I don't have a problem as long as the subscription is cancelled, cause I can't be paying for something that I don't have anymore.... Today 22 December boom a debit order of R199. 00 Went off my account meaning that they haven't cancelled the contract, this is just so annoying.... Incompetence...