Very poor service

I had an accident in 2021 and the insurance company requested a log summary from car track. I discovered that my tracker was faulty and has never been active because the log summary was blank and no one explained until I asked. I was told that it's my responsibility to call them to check every 2 months if my tracker is working and they said it's written in my contract . If knew that I would have never taken such a poor and risky contract. They offered to fix the tracker and I declined and requested to cancel. I sent an email cancelling the contract in May 2022 because I had been paying for nothing, they still continued to deduct and even handed me over to their lawyers. I have been reversing their debits and they keep changing references. Instead of cancelling the contract they keep calling me asking for money.Today they deducted R2308.68 on my account . It's only them who know what am I paying for .