Tracker takning money out of my account

I have been with Tracker for about 5 yrs now. They phoned me to tell me that my unit is faulty, they said they would call me back so I could decide if I wanted the unit still. they never did, after emailing them I finally complained on Hello Peter. only then did they assist, and cancelled my account. now they have debited my account again even though they have sent me a confirmation of cancellation. So the unit is faulty & they have sent me confirmation that my account is cancelled, yet they are still charging me. Ludicrous, I must now pay for a service that I do not have. these people only want our money, with no service in between. this is absolutely absurd. I wouldn't trust them with another tracking device again.