Who called from 3018613048

this person keeps calling my office number and never says anything,  just listens and does this several times a day.  I would like it to stop.  Rather annoying.

this number calls every day and several times a day and whenever i answer the person hangs up right away. it's extremely annoying.

I keep getting calls from this number at work and no one leaves a message.

I also keep getting calls from this number to my cell and I've tried to call it back but no one answers. I would really like to know who this is.

well, i am too getting calls from this number but somebody speaking spanish