Who called from 5403225186

We have received several calls from this number, but won't answer.  They never leave a message. Anyone know who this is?

When I called the number, the recording says, "Thank you for calling the Fundraising Information Center.  We tried to contact you earlier with a message from one of the finest childrens health organizations or public safety groups.

I often find this number on my caller ID . . .but no message on my voice mail.

They say they are calling on behalf of the American Breast Cancer Foundation.

appears to be an unlisted number out of Fredricksburg Maryland. Supposedly a non-profit solicitation organization for various charities - but I have my doubts