Does 'Do Not Call' Still Exist?

OK, so here is a quick rant. While at home with the Chicken Pox all this week, the phone has literally rung off the hook. Most of the calls have been friends, family, etc. checking on me to make sure I am ok.

But, another certain percentage of calls have been from credit card companies, mortgage companies, AT&T, etc. So, my question is, does the do not call list not exist anymore? What's up with the calls? I've had to literally hang up on more people this week than ever before. I hate being rude, but when people invade my home with solicitation I don't take kindly to it--especially when I feel bad.

Does anyone know if there is something I need to do to make sure we don't get these calls anymore?