Who called from 3052304831

Received 4 calls in a row from this number. I only heard something similar to a one time beep static or electric sound and hang up.
Called back and hear only music.

I get the same message the past 3 days from this number. Did you ever figure out who it is?
Thank you

This number has call at least once a day, message only says [first,last name] call us back. Or other time it will say [first,last name] we are calling about case #****** , haven't returned the call