Keep on asking for money after cancelation

I logged a complaint on 18 Oct about my account being in arrears after canceling. I got a quick response from rain and we agreed that I will pay for 1 month cancelation fee. The link was emailed to me and I made a payment. Immediately after the payment was made, it indicated that I should pay for another month that is outstanding. I send an email to rain which was ignored and a few days later I received a notice again indicating that my account is overdue. This is ridiculous!