The National Association of REALTORS has an ethics code that prevents - or should prevent - any agent from interfering with an existing relationship you have with another agent. Furthermore, you are in a contract with your current broker, and it sounds like you're in a contract with a potential buyer. If that's the case, IF you get your short sale approved then it sounds like the bank will pay the commission of the agent that you currently have. Any new agent will either go without compensation or you'll be paying them. Chances are, an attorney is better suited to handle your questions anyway. Remember, there's nothing anyone can do to force that lender into taking less than they are owed, no matter what real estate agent you have. Negotiating with a large corporation over a small amount is almost futile. Anyone you talk to there is going to tell you the answer you've already heard and then hang up. They have nothing invested. The best you can do is keep trying and talk to the 1st lender and see if they will step in and assist the negotiations.