Who called from 3016576300

I called them back and they hang up when I require to talk to somebody about this multiple calls without reason.

It's Smith Barney.  They're nuisance marketers.  Our company is on the DO NOT CALL! list.

Calls multiple times during the day but leaves no number.  When someone other than the person they are trying to reach asks for more information, they state they will try to contact the person through another method.

is this a sales company for buying annuities.  i used to get them i think

this number keeps calling my boss at work.  getting really annoying because I pick up and there is no answer