Block the number. I keep getting calls from Travelocity when I'm at work. They for some reason want to talk about my almost stay at the Days Inn & Suites in Anaheim. Not really sure why and when I have time, I'm too lazy to call back.
You can't go to your provider and ask them to block it? That's what I do. I've got Verizon and I can either go into a store and ask them to block the number for me, or I can access my account online and add a number to the blocked list that way. I have a few numbers I've blocked. Had a telemarketer that would call me day and night no matter how many times I told them I wasn't interested AND that it was a tad inappropriate to be calling at 3am. He didn't get the hint, so he made the blocked list.
Side note before work, I'm the world's biggest baby. I found the alternate ending to Titanic. It's only a 7 minute clip, but I sat here crying like a baby lol.