Mr sim

Hellopettet I need help I have a contract with Matrix car track I've being trying to cancel it and asked them to come and remove the thing out of my car now is messing with my battery they don't respond, I sent Emails, calls and inboxes also posted on their pages they blocking me no one is responding to me please help me I have the videos of their bad service and calls while talking to their rude customer care service also tried pressing the panick they gave me no respond, I heard that if you change account number to avoid them taking your money they change References please help me