I want to buy a site (empty) stand. The agent showed me the stand and I liked it. Agent then informed owner and my offered price, it was less that what the stand was advertised for. But seller accepted telephonically.

Then, while I was waiting for the offer to purchase papers from agent that I had to sign, agent tells me the sellers husband has now told the seller not to go ahead with the deal.

What is my legal right here? I want the deal to continue