Door-to-door sale man lies and overcharges

I lived in Mentone Indiana, I had just moved there this guy came around telling me and my husband how much cheaper they could supply our gas than NIPSCO, well that is a lie. In February we moved to Wabash we received a letter they were no longer our gas and electricity suppler, which was great. Today I got my NIPSCO bill 5/3/11, charged us $605.60 final payment. what a scam.