Billed even after term of contract

I've been a cartrack client since 2020,and have been paying without fail for the duration of my contract,however after the contract was exhausted I called to cancel my contract as I didn't need it anymore as the car was no longer in use.However that was never the case I've been debit time and again which was surprising because to my knowledge the contract was terminated. Till today am still being billed and told am in arrears this month alone I was debited 3 times(R159,R850 & R848) I am unable to do my other finances obligations due to this.The service review is really not the standard one would expect from a big Name such as cartrack.Lastweek again I escalated this still no call or any correspondence from you.Each time am told the supervisor will call me and never does,how fair is it to be paying for a service you don't need?I need this to be cancelled immediately and be refunded back all the money taking *******,I requested the audio recording where I specifically told the call assistant that I am not longer interested in continuing with this server as the car isn't running anymore.