Rude Agents and Unauthorised Debits

I had an account with Cartrack, but I asked to cancel my contract due to affordability reasons. The contract was confirmed as cancelled on the 30th of July. I had outstanding premiums, so my account was in arrears; however, I settled those arrears - which came with resubmission fees.

Now Cartrack is debiting my account for no apparent reason. I reached out to them via WhatsApp, asking for a refund. I was then transferred to their accounts department, where I was assisted by a very rude lady. I remember telling her to not raise her voice. I really don't know why she was so ****ed when I was merely asking about money taken from my account for no reason. She said that the money was for resubmission fees, but the arrears amounts that I paid already carried the resubmission fees. I decided to let it go because there was no way I was going to continue talking to that lady.

Now today again, Cartrack just helped themselves to my money. I am really upset over this because I ended my realtionship with them and settled what I owed to them.