DITTO! I also called back "Number not in service". They've been calling for several days, We are a business and I answer the phone with a business name. I'm going to try to answer with "hello" next time to see if they respond. Some telemarketer controls are set to only respond to "hello" because their target is home owners, not businesses. So, the call is automatically disconnected if the machine doesn't hear a "hello"; then the telemarketer doesn't have to waste time. But if that's the case with this company, I don't know why they keep calling back. I'd think the number would be removed from the data base and not called again.
Well, I tried answering "hello", but the call was still disconnected. So, so much for my theory. LOL. I'm just not going to answer when I see that number on caller ID anymore.