another spammer with spoofed number-calls and does not leave message

This deadbeat left no message on my answering machine, but the caller id screen read "East Greenwich Rhode Island". So I called back (with caller id blocked), and got a recorded message that began "Hello, we are MDS Communications, a fundraising company that specializes...." I immediately BLOCKED, so get lost. They also use other numbers, which I have already blocked.

left no message and hung up.  Blocked them.  Probably spammer.

Calls daily X4-6 no message left