More like "Mixed Up" Telematics (Unsatisfied Customer)

I have been getting back and forth from Mix Telematics since May 2022 and not getting any feedback. They debited my account with the wrong amount (Not as specified on my contract). I sent them emails, have been calling for the longest time and still not getting it rectified. I cancelled the service since I no longer have the vehicle and they still kept debiting my account. I reversed the debit orders, only for them to record as missed payments, yet I am no longer using their service. I make a call almost every week to follow up, yet their finance department tells me to take it up with customer care, which I have done several times. Every time I call, as is typical with call centers, I will get a different consultant, whom I have to explain the story all over again (Do they not make notes on the call, with updates as they speak to the client, so that the next consultant knows the history?) Recently, they attempted to debit my account once again with the said "Outstanding balance" which was successful. I called again, they said they would get back to me. It's been another two weeks since then and no answer once again. I am fed up with them and their useless service that does not amount to any results. Mix Telematics, can I please have my money refunded and that account closed.