Poor service from netstar still money from us

I cancelled the policy in writing August 2018 on the 22. On June 2018 I did trade my vehicle but before I did call netstar to uninstalled the tracker on my car. They told I should proceed to buy other car and they will install the new tracker and it will automatically cancel the other tracker as I have account with them which I did. But now I have two accounts and they still deducting money from it. I did request them to cancel both accounts and give me the cancelation fee quotation but even today I didn't get it and they still deduct from me. I did send them hundreds og emails but I don't get any response. I was made to understand that I need to send cancellation emails to ********** I have written multiple cancellations emails from August this year. This nonsense company still debits my money! They even take my account to Debt department asking me to pay 800 before they can close as I stop paying them. I did make payments of 800 and still they deduct from the amount and the asking me to 603 hows that possible. This people they playing the game with us still from us. I'm still waiting the response from them.