Numerous email ro netsatr with no luck of been assisted

Guys I now need help,I don't know how many times should I send emails to Netstar,telling them I do not have a car,and they dnt stop debiting my account. I have sent emails asking them to track the car they are debiting for,no answer?.they now send sms for me to call them ,we must pay them and do collection again for them while they can't get their records straight. Plz stop debiting me I do not have an account with you nor the car,it was sold in August .