Justenergy Justenergy rip off with just a phone call by creating a agreement cincinnati Nationwide

We leased a flat in cincinnati in october 2014 and called duke-energy for a electric supply. Here comes the disaster call from JUSTenergy late in october last week and our fate started to turn. They said if we subscribe with them, we would get stable rates for electricity where as other suppliers charge too much etc. The trick part is my wife DID NOT notice the difference between Dukenergy, Justenergy. She said ok to the person who called and thats it. Its DONE, No SIGNATURE, NO AGREEMENT shown. our november bill was 100$+ for 1000kwh approx, December bill was 250$ for 1600kwh and january 350$ for 2000kwh.
We asked this to Duke energy and they said we had a contract with just energy and it started from nov-dec bill, those are their rates. We were shocked. We called just energy and asked them to politely disconnect their supply so that we will shift back to Duke. We called JUSTenergy on january last week. Now its february again Justenergy charges got added in february bill and no one cares about our fate.
The worst part is they signed us for a Justgreen which is like a charity or something. They Rip you depending upon the usage. We dont know what it is and why/how the hell we got into contract just by a phone call.
This is our disaster story and hope you guys sp-t on their face if they ask you to signup.