What can I do to protcet myself from shoody roofer now wanting to go into attic?

We got a "new roof"... well, that was what we paid for, but the roofer did a lousy job. Tried to get him to fix it, but no such luck; just excuses and avoidance. Now he thinks it will be cheaper for him to "fix" it from in the attic.That means coming INTO the house with his group of "followers". The attic is super low(head clearance) and is full of 50 year old pink blown-in insulation. Can I make him provide proof of insurance? proof of citizenship for his workers? Can I make him sign some form holding me "harmless or blameless" if he gets hurt up there while trying to gerry-rig the roof problems caused by his workers in the first place? Here's the problem. We paid for the replacement of any deteriorated wood before the felt, tar and shingles were installed. Easy enough 'eh? NO. Feeling excessive "sponginess" in the roof, I went into the attic. Beyond stress fractures all over the place from his foreman beating on the planks, there are areas that simply have no wood at all! You can see felt, big size 13EE foot sized areas with NO WOOD! The last 2 months have been me tracking him down and him saying that's normal/!?! or that it happens because my house is old, and MANY other ludicrous excuses. Finally I filed w/ the ROC. That REALLY made the roofer mad and on the day of the ROC inspection, the roofer showed up with 4, yes FOUR people to back him up. So every time the inspector would say something wasn't right, one of his "dudes" would pie in with some excuse. So, there's me, a mere housewife, the inspector, and 4 dudes who kept yapping, rolling their eyes at me, and making light of anything I saw as an issue. "Oh that's from walking up here when it's hot".. Actually nobody has been on the roof to walk (hot or not)... eyes roll. on and on. Finally, the inspector said he would close the complaint if the roofer and I could have a meeting of the minds as to how to fix the problems. I said NO, because the roofer has told me 5 times he'd fix it and has done nothing at all but ignore me. Finally the inspector said he'd give the roofer 2 weeks to fix it, and thet he'd let us come to an "understanding", but then to call him if it wasn't worked out in 2 weeks. The inspector left and I endured another half hour of how it's normal for an old house to have broken boards. (that weren't broken before the new roof). Finally, the roofer said he would fix the broken planks from the inside of the attic to make it where he didn't have to remove the shingles. I was unable to explain to his tiny mind, that replacing wood that is not connected to anything is... impossible. So, now he wants to crawl around in the attic with the 50 year old pink blown-in insulation and attempt to replace the boards in the tiny crawl space (with no light or ventilation)... to save him money. Everytime I've been up there, I've choked on insulation and there's not even a catwalk up there. If he or one of his pathetic helpers gets hurt, I don't want him fileing against MY homeowners insurance!!!! What can I do? While it's easy to say he's lisenced & has a bond, he has sniveled and moaned that me wanting my roof fixed is going to make him lose his business, and how mean I am for that. So PLEASE, guide me! Can I require proof of citizenship on his helpers? Can i have them sign a "hold blameless" or some sort of form? If so, what is it really called and where do I get it? I looking for a hero. i hope someone knows the answer. Thank you for reading my dilema and offering suggestions.