I had a person knock on my door saying they were from Terasen Gas (Fortis BC now) asking to see my bill to make sure it was correct. I asked them why and she said she could save me money. She went on and on about how I can save money. That's when I knew they were some energy company trying to get me to signed a contract. She misrepresented herself which would be consider fraud. I said I'm not going to show you my bill and proceed to close the door on her and that's when she stuck her foot in and started to push the door open.
DO NOT let them see your bill. They want to see your bill so they can get the account number and name. They already have your address obviously. I saw on the news later on of some shady sales people forging signatures on contracts and the home owners having a hard time getting the contract cancelled.
There's no way I'm paying a middleman for my gas delivery when I can get it straight from the supplier. Afterwards I checked what Terasen's rate for gas and delivery and it was 3 times cheaper then what the girl told me her company will charge me if I signed up with them. So if I signed up with her company, my bill would have tripled. That's not how you save money