Since everyone else replying is telling you what a lazy horrible person you are, I'll go ahead and let you know that I agree. Theres nothing they can really do at this point. And because of that the companies only real option is to just stonewall you for as long as possible.

EDIT: And if it weren't for the long history of large companies suing security researchers for blackmail/etc when they try responsible disclosure I'd have probably sided with everyone above.