Smart One Energy Ripoff on my gas bill-Charged double Kaser New York

 I received 2 bills in a row from Washington Gas ( which is my main gas supplier) with a third party supplier by the name of Smart One Energy. They said I authorized them on my account in June 2015, which I did not. I looked thru all my bills & have not seen any charges from them till January 2016. They were double charging me what Washington Gas was already charging me monthly for doing nothing. They charged me $99.89 in January 2016 & now February 2016 another $99.89. I called them to discuss situation & all they said was sorry for the inconvenience & they would cancel affective today February 29, 2016. Then hung up immediately after. They did not offer a refund of any sort & no other explainations of why this was done. I called several times after that phone call & they have just hung up on me every time I let them know my situation or give my account number. They have ripped me off & I would like a refund. Or at least a written apology & formal cancelation letter because apparently they don't do any formal legal documents (example contracts of starting a service with them).