From what you're saying, I'm guesing you either rounded off the hex portion of the bolt-head, or the bolt-head snapped off entirely, leaving the shaft threaded into the block. If you rounded off the bolt-head, you can try using a Metrinch-type socket that's designed to grip rounded bolts, or something like a Gator-grip or other universal socket if you can fit one in there. Otherwise, your other option would be to drill a pilot hole and use an extractor to back the bolt out. If you snapped the bolt-head completely off, then you should be able to lift the head off with the bolt-shaft still threaded into the block. Then you could grind two parallel flat spots onto the shaft and use pliers, a crescent wrench, Vise Grips, etc, to back it out. If neither of those seems like a feasible option, then you may have to bite the bullet and have a machine shop drill it out.

People aren't online 24/7, so you can't always expect to get a quick response, and that attitude doesn't exactly make anyone want to go out of their way to help you.