Call back says "we are MDS telephone fundraising." That's just another way of saying a telemarketing boiler room renamed so that they can solicit funds for charities. Most of them keep about 90% of what they collect.
They called the first time March 6 and they've called a total of four times now. I will never answer and they never leave a message. Thanks 800notes. With your posts I know it's not a volceless long lost relative who is trying to contact me.