Calls and doesn't leave a message. Why do we have a no call list?

This numbers calls at least 4 times a day.  Early in the morning woke up my kids and late night calls.  Getting very tired of it.  Been going on for 2 weeks.  Tried the call back-didn't work for me.

I called the number back and got through.  Was prompted to press 1 to get removed from call list.  I did so and hopefully it will be off within the 30 days they stated.

Called at 1:23pm on 12/11/2009, left no message when machine picked up.  Reverse phone detective says this phone is registered as unlisted in Yonkers New York.  Highly unlikely that a respected charity like March of Dimes would be calling from an unlisted number.  Sounds like an imposter to me.

I have been receiving daily calls from 914 290 6339. No one answers.