Not happy with customer service

In August I traded in my vehicle. I therefore informed Cartrack of this trade and asked them to transfer the account from traded in vehicle to the new vehicle, unfortunately that was not the case instead a new account was opened meaning I'm now paying for two vehicles one of which I have no idea where it is at. I keep calling Cartrack weekly for progress but I'm not getting any assistance. Each time I call I'm told the matter has been escalated to the other department and are awaiting feedback but come month end I'm still paying for both cars. Can this be sorted out please cause it is not my fault.