Debited for 1 year for a vehicle I dont own

I had a tracker fitted in August 2020 , I traded in the vehicle in June 2023. I contacted the local branch and was given the advise over the telephone that the contract would fall away in August 2023 so it would be better to just wait till the contract ends and they would start a new install and contract and I would not have to worry about cancelling and paying the cancelation fee. I decided not to do another tracking system with them and expected the contract to fall away as advised , however looking at my bank statement I realized they were still charging me for a vehicle i dont have . I contacted the branch in PMB and they asked me to call the head office where I was told that there is nothing they can do and the money paid for 1year I would just have to accept it as my fault as the call to the sales person was not recorded so they cant do anything about it