IDT ENERGY Scammed me Trenton New Jersey

They came to my house and ask me if I got my safe link phone in the mail and I said no. They told me I'm untitled to a 300 dollar rebate because I'm disable and low income family. They said they can sign me up right now all they need to see is a copy of my page bill and my I'D. I told them I didn't want to switch utility companies. They said they are with safe link and not a utility company. They lied to me. I never received my rebate. I went on line to check my page bill wondering why it's so high and seen IST Energy charges on my bill. I have called them and they won't cancel the charges. Please help.