Have you experienced this?

Have you experienced this?

So after years of being part of the community discussion, I decided to start selling services on the marketplace. As a writer, writing gives me joy. 

So, I got in contact with some buyers and while it is going smoothly with some of the buyers, some are making things difficult. Have you being in a situation where a seller ask you to work without ordering your service to hire you? Promising settlement when you are done with the work. How did you handle that?