My question involves business law in the state of: New York
I'll try to make this fairly concise and to-the-point. I own a business in NY, and have pay another company to take over some of my clients. They perform the work, and clients are aware that they are a different company than mine. Recently, this second company failed to perform work that was supposed to have been done. The clients are actually satisfied with me, but angry at the other company. I was led to believe that assignment of a contract in New York does not have to be done in writing. Is there a way to prove that by paying the other company and them performing all the work that this was an assignment? And if so, do the customers have an option to sue the other company instead of me?

