Impossible cancellation

After back and forth for over 3 weeks with a tracking device that wasn't working with no one available to assist I sent through a request for cancellation on the 26th September 2023. I was told about the 30 days notice which I didn't have an issue with. I got an email stating my contract will be terminated on 27 Oct 2023 which is after the 30 days. To my surprise my bank account was debited again on the 27th October and now I'm told I have to serve another 30 days notice. Why is it so impossible for telematics to stick to their end of the contract????? After quering this with the call centre they sent another email, now without the contract end date. I've reversed the debit order with my bank and I want the contract cancelled. Why is this soooo difficult??