Who called from 2048004023

keeps calling every day even in the morning at 9am..very frustrating.
I called their number..some kind of care centre..probably a charity!

Every morning, 09:00, never fails.
They also call in the afternoon, around 2 or 3-ish.  

The line usually hangs up, but this time a lady on the other end said "Hello? (pause) Hi there," before I hung up.

I get this call almost every day and sometimes several times a day!!
There's got to be a way to block these calls - instead of just ignoring them!