Have you considered a complaint to the State Attorney General's office in your home state? It was a different scenario, but I had a problem with my cable company and they (WA state AG office) sorted it out within a couple of weeks after I complained. Any company doing business in your state should be answerable to the AG.
Same exact issue I have. Hopefully this will eventually land in the US AG's lap. Australia is sueing Samsung for their water resistent claim. I would suggest your local small claims court if you have time. After contacting the Texas AG, I'm taking them to small claims court.