Who called from 3604603786

Got 5 calls in a row in 5 minutes. Number is in my reject list, but shows up in missed calls.
Two other calls during the week.

This number has called me several times & hangs up on me or doesn't leave a vm. It also has no dial tone when I call back! How did I block this number it is driving me crazy!

Some stupid automated telemarketer asking to take a survey and you can get 2 free tickets to the bahamas or some stuff.

No message left.

Got a call from this number today. Didn't leave a message.
How did they get our number? It is only activated for 3 (!) weeks and we did no calls in the U.S.