Who called from 7273387285

Got one call, left no msg.  Called back (using *67) and all I got was music for a minute, then nothing.  don't know who it was, probably scammer.  From Florida.

CID showed 'UNKNOWN NAME'.  My answering machine is turned off so it rang 5 times and hung up.

Called several times and when I said "hello" there was a hesitation so I hung up

keeps calling but doesn't leave message

Robo caller supposedly from G.E Security. Caller id shows unavailable. Leaves no message but if you answer phone will identify himself after a short pause, obviously a robo caller M.O.