Breach of Contract - Unauthorized Account Debits

The wrong unit was installed in my vehicle in November 2022. I picked this error up in December 2023 and notified Cartrack of this. I had to follow up in January to try resolve this problem. An appointment was booked for February for them to come and replace the incorrect device from my car which Cartrack failed to honour. I then notified the company that they were in breach of contract and unable to remedy the breach and therefore I wanted to cancel this contract. Apparently even though Cartrack is in breach, I have to pay a cancellation fee for their incompetence. I phoned so many times to try and get this resolved, each time I call I’m assured that the cancellation will be processed at “no fault” to me and then a few weeks go by and Im called and to told to pay up. Every month without fail, unauthorised debit orders go off on my account from Cartrack. I have been going back and forth with Cartrack since December 2023, it is now August 2023 and there seems to be no resolution in sight. Im so sick and tired of dealing with this!