Nester ****med me of 7 years premiums without providing service

I entered into a contract with Nestar for my car tracker for a period of 3years. The agreement was that the contract will expire and they will stop deducting from my account. My car is almost 10 years now and they never stopped the deduction and I don’t get any updates from them regarding the car tracker. When I try to call them to cancel the deal/deductions they don’t pick up the phone and the phone gets engaged but when I tried to call them at the bank they answered. Please be warned never ever use this car tracker they are ****mers😡