Who called from 3018888875

This number called me 3 times today, when I tried calling back, it said this number is not valid.

Never leaves message

they always call and never talk wtf people don't have anything else to do but call me and the people ^

I don't know but I think this a fraud. This number called talking about I got selected to get a government grant. But before I receive the money I must pay $300 to pay the taxes for my state.  I'm like y don't they just take it out of the grant but obviously they can't.

well not call but blow up my phone and text messages