If you believe that doing this will be of benefit to you professionally then do it, although personally I wouldn't if I were in this situation. I think the only positive outcome is that you will feel satisfied and that you have had the last laugh, and that feeling won't last long. As others have said, this type of thing (unfortunately) goes on all the time and proving it won't be easy. I felt bitter about the way a HT in one of my previous schools treated me, she had a little clique including my HOD and if your face didn't fit they would bully you out, which they did with me as an NQT. Other trainee teachers also commented on this too. I was going to take it to LEA level as a complaint but I feel now my revenge is that I am so much happier out of there I felt that I would have done myself more harm than good if I'd have complained, and I get the feeling the same may be true in your situation. Try to move on from it, it feels good when you get over it.