Really sorry to hear about your situation. It is very difficult to sue a hair-transplant surgeon. You sign away many of your rights to sue in the pre-op paper work and unless the doc was drunk or high during surgery it is not going to go well. The chances of you getting other doctors to testify against another surgeon is very unlikely at best. There have been a few cases on this board where unsatisfied patients have tried to pursue civil actions against surgeons and they all have gotten shut down. Most recently there was a big to-due about one of Dr. Umar's patients and the thread explaining the situation was locked after many weeks of back and forth accusations, which by the way was probably the right thing to do by the moderators as it was really just going around in circles...you can still look it up if interested. That patient basically gave up because he was threatened with legal action and that gets expensive very quickly. You could probably get a personal injury lawyer to take your case as many of them will take just about any case, but I would imagine after looking into it further they would not spend all that much time on it.
Sorry I can't be more encouraging for you but that is the reality of the situation as I see it. Do you have any pictures to post? Was it a recommended surgeon? Maybe it isn't as bad as you think it is and you can get some suggestions on how to move forward. Your situation also underscores how important it is to deal with reputable Docs who stand behind their work and if a bad result happens are willing to make it right.