bad servise

<div>I am disappointed with car tracker ,I have been paying the tracker for almost 5yrs until I paid my car instalment, then on august 2021 I decide to call the company letting them I don't need the contract anymore and they promise me that I should pay for one month then after they will let me that the contract is cancelled. But even today they still debit and when I call their numbers to put me to the direct component ,it does not went through and again they are threatening me with sms that stated is their attorneys and more over they deducted 2000 from account my consent plus the instalment which I reversed, can you please advise me to do before I seek legal advise</div>