Account paid off

I made an arrangement with Cartrack representative Lettie to close my account (BOGO00045/BK60TSGP) and we agreed on 2 installments of R600.71 each, 1st debit order of R600.71 can off my account successfully on the 25/01/2016 I then made a transfer of the remaining R600.71 on 26/01/2016. On the 05/02/2016 I then sent proof of the second payment to Lettie & clientservices to request that the account be closed and the debit order that was supposed to come off this month (Feb/2016) be cancelled as i had already made the full payment, I then recieved and email from Busisiswe stating that my request has been honored for the account to be closed and the debit order cancelled, now am waking up to an sms that an amount of R600.71 has been debited of my account I mean is this how you treat loyal and paying customers?. I now have to go to the bank to make a reversal of that debit order which in turn makes me look like someone who doesn't pay his debits. Instead of you guys (Cartrack) honoring customer requests you (Cartrack) are harassing me daily with sales calls for your so called panic button but you can hardly do something as simple as close an account.