Do not sign up with Tracker !! - unable to cancel your DT order

I've cancelled tracker - paid the amount on the statement and they still deduct from debit order. Each time i phone i get the same story - amount still in arrears - Only way to cancel DT order is to cancel at Bank itself - Do not sign up with Tracker as they are not able to Cancel the Debit order on your account and will keep deducting from you account - even if you've paid !!!!!!!!