Stealthee is correct. Sorry, but unfortunately they are not obligated to honor any previous warranties. I saw this all the time when I worked in finance and companies would buy another company out. That leads to all new contracts and all previous contracts are null and void, because you now have a contract with a defunct organization. Keeping the name doesn't mean anything unfortunately. Now, in this day and age you could possibly raise a stink and if you were lucky enough to get a local news channel to hear your story and do a segment on this company, they would probably cave if they wanted to avoid any negative publicity. But they are not legally bound to honor a contract made by a previous entity.