Viridian Tripled my energy rate Chicago Illinois

I received an electric bill from Com Ed for $674 (usually my bill is around $100).  When I called to inquire, I was told that the energy company I was using (Viridian) had increased my rate from about 5 cents to 16 cents.  When I called, I waited on hold for 37 minutes and was told they mailed me a letter, which I never received.  

I asked them to look into this, I called back and waited online for 40 minutes, only to be told there is nothing they could do.  I had an option of speaking with a supervisor to continue my service and possibly receive a $25 service credit.  No Thank You.

I feel taken advantage of.  This company contacted me through a desperate old college roomate who was looking to make a commission.  She convinced me that this was the way to go and that I would be helping the environment.  Now all I have is an electric bill I cannot pay.