First Energy Solutions False claim that I owe them for services after transfer to another electric provider. Akron Ohio

I just received a supposed collection notice from R M S (Receivable Management Services Corp.), PO Box 361595, Columbus, OH 43236 for a claim amount of $295.00 from FirstEnergy Solutions.  I went with another electric utility provider in October, Constellation an Exelon Company which offered a lower rate. 

Everything was transparent and my utility bill still arrives from OhioEdison as it did before but in the account balances by company it shows Ohio Edison and a fee, Constellation NewEnergy Inc., and a fee or charge and FirstEnergy Solutions Corp., and next to it the amount due 0.00.  Now I paid the total on the bill and have for the past seven years since moving to Ohio as I always have throught electronic payment from my Credit Union.  Today out of nowhere I get a collection notice that I owe FirstEnergy 295.00?

I have copies of all my bills and after pouring over them I can't find any unpaid balances and when I called RMS they tried like heck to bully me into paying right away by criedit card and I told them no, not until I call FirstEnergy and Ohio Edison and the Public Utilities Commission for Ohio and get to the bottom of this bill.  I heard her say "But you will......that is when I hung up on her.  It's late on a Friday and the first business day after New Years I start my calls.  I see so many complaints against FirstEnergy I'm very suspicious now about the charge.