Horrible Service @ Telematics

Mixtelematics tracker is the worst service provider ever. Last year in October one of their agents called to advise me that my contract expired in April 2018 and now I am on a month to month basis. I then told the agent that I'm not ready now to renew that contract he should just give me few days to think about this but as we all know sales ppl are forever pushing for a sales so I ended up tell him to cancel my contract. Few minutes later another one called and I told her the same thing to cancel my contract. In November they debited my account and I then returned that debit. They called me and I told them that I have canceled this contract and they should stop debiting me. The consult said to me according to their records I haven't. So I told him what happened about the 2 other agents that called me and I was told that the company that called me was outsourced. I told him that to me as a client I don't know which companies do they outsource what matters is that they called me about my Telematics tracker device that I have with them. That agent still couldn't assist so I decided to call this company and got transferred to cancellations and I received proof that the contract has been canceled as if that will stop them from continuing debiting my account. I then received a text msg from attorneys on the 18th. 01.2019 and I called them and I was told my account has been handed over to them. They ask me to send them the proof of what I was telling them and I did. Today on the 22nd Jan I received a message that shows that Telematrix has again debited my account. So I really don't understand what does cancellation mean to them. I need this to be rectified coz should I find out that I have a default because of them God forbid.