One vehicle, two accounts?

I recently opened an account with Netstar for a tracking device to be installed into my vehicle. However for the past 4 months I have been billed twice with Netstar collecting two premiums from my account. I have called every month to rectify the matter with Netstar who assured me that the incorrect account is closed and that I would be reimbursed the incorrect premiums. However two premiums have been deducted this month yet again and no reimbur*****t received. I feel cheated and **** to and I want this issue resolved immediately!!