Have you told them that you are going to blow them up on internet and will sue them ? That might light a fire, Also always go further up the chain . Sometimes the higher you go to complain the better the results will be. You have the proof so it would not be in there best interest to let you sue them and make this a big issue. i deal with a lot of litigation- i am not a lawyer- but this would be a real quick lawsuit and they would settle before it got anywhere.
If they wont budge and you went u the chain either talk to a lawyer or take them to small claims.
