Who called from 3017105621

They called and hung up

Caller (woman)said "Thank you" when I answered and then hung up.

This number keeps calling my home phone.
I called the number back and a recording said that they are Donor Services Division.
It sounds like a telemarketing company for charities.
There was no option to be taken off their list.
My number is already on the Do Not Call list.

Annoying...

Searched the number and it came up a landline in Waldorf, MD.  Looked like from an apartment complex.

When trying to call back blocking aout my number...I get a message "sorry the toll free number you have dialed is blocked from your calling area"...what type of shyt is that I am calling from the 301 area code