While agreeing to work on a specific project, writers should bear the responsibility for their actions. They should provide a well-reliable paper for the payment being received. I am quite sorry for your experience. As a writer, I always demand to send me instructions before agreeing to start writing anything. Yet, once I feel that I can complete the paper, I do my best to make it reliable. You should find one writer who would do all your work, whom you can trust, rather than switch from one writer to another.