IGS Energy review: New service

Door to door salesman is trying to switch my service at 731 Conservation Cir in Fairborn OH 45324. I was tricked into signing a document that I do not want enforced. Very persistent language and sales pitch. No credentials offered to identify himself as an IGS employee. He was not in a company truck. I am concerned this is a scam and I want to cancel any agreement presented to me today.