Frustrated customer

I am writing to address an issue regarding my account with Rain. Last month, I did not make a payment, and as a result, I did not receive any services. This month, I made the payment for the current period, but I am now being informed of an outstanding amount for the previous month, despite not having used any services. I have requested the cancellation of my service, but I am being told that it cannot be processed due to the disputed outstanding amount.