Who called from 4844246749

Leaves voicemail with no message; once said 'hello hello?'; has 4 times in one day, so far at 10am today, has called twice already!

They are calling me up to 10 times a day!

Someone at this number keeps calling me at one of my old employers numbers.  He's not amused and there's nothing I can do to get them to stop!

I receive numerous calls per day from this number, I finally answered it this morning and they hung up on me.  So annoying.

This has been the most recent in a series of spam calls I've suddenly started getting over the past three days. I am blocking each number as they come up. Calls are showing up from all over the country. They never leave a message, and when I google the number it is always listed as a spam number (like this one).