This might be a law question.?

I made some phone calls re purchasing pre 1933 gold certified coins to keep my funds safe. One man mistakenly thought I had given my OK to a deal when I had not and I had specifically told him I had not given him the go ahead or the contract yet. I told him I needed to check something out and would get back to him in 5-10 min if I wanted his deal. I did not call him back and he went ahead and billed me for it giving it a contract number. I cannot be legally indebted to his company as I see it. Does anyone with legal information have any input on this. I'm kinda upset over this nonsense.