Modem or internet service provider?

Hmm, sounds like you've tried everything you possibly can to resolve your issues. Where is your provider in all of this? They should be doing whatever they can to help if they want to keep getting your money, which doesn't look like it's going to happen. I think if you're going to look for another provider, you shouldn't have to go through even more stress. This site really helped me, and hopefully you'll have an easy time of it as well. Good luck!