Poor customer service

I have an account with rain which was not working for 4 months,in January this year I upgraded to 5g network and my payment is due on the 25th of February bit now they've suspended my line because of "areas" and today I called the call center to ask about the outstanding amount, they say it's for keeping the account active,to my surprise i have no invoice for September,October,November,December but all of a sudden I have for January??how sad the funny thing is no one can account for the outstanding amount??now they've blocked me from my online account ,what kind of service is this???