Cancelled services, poor customer service!

I’ve been with Matrix for over 6 years, my contract was on a month to month. I enquired to what the process was if I wanted to cancel and was told I could cancel immediately. I requested to terminate my service on 30 May 2024 and didn’t receive confirmation. I then resubmitted a request on the 29 June 2024 as the vehicle the matrix was fitted was sold. Still no confirmation of cancellation and no communication. My account was then debited even though I cancelled. I had to pay to revoke the debit order. I called Matrix and escalated this but still have not received any response or feedback from Matrix, service and the consultants are so rude and abrupt.