They offered termite treatment and warranty for $1...

They offered termite treatment and warranty for $1200, paid $100/month for 12 months. The guy who came out to my house handed me a credit card terminal to sign, showing a $1200 charge. I handed it back to him and reminded him that it should be for $100. He did something to the terminal and handed it back to me, no longer showing the $1200 charge, and I signed it. A week later I noticed a $1200 charge from Terminix on my Amex bill. That was about a month ago and I've been going around in circles with 800 TERMINIX as well as the local branch, etc. I asked them to cancel the service and they emailed a cancellation confirmation but didn't refund any money. I've spent several hours on the phone with them and no one I've spoken with has admitted having the authority to refund the bogus $1200 charge. Also they didn't deliver a written copy of the contract/warranty as they promised. I'm filing a chargeback with Amex and expressing my discontent here.