I contacted a moving company to get a quote and they started the job without my permission. The job is for a property I am putting on the market.

I asked them to come to the property so they would know exactly what we wanted to move so they could provide an accurate quote. I have this in writing via email where I tell I the purpose of the "walk through" is to get an accurate quote. I called them about a week after the "walk through" and they told me the job was basically done. I never signed a contract, and I never put down a deposit. About 2 weeks after they said they were finished they sent a bill for $12,000. I've tried settling with the owner but he's unreachable. What are my rights? All of my property is in storage at their company. It must be illegal to do a job without permission and then send a bill no?