Who called from 4017748401

who is this?

keeps calling leaves no name

Got a call from these guys tonight; the male caller asked for someone named Mason.  I told him it was a wrong number and he said he'd "take the number off their list".  An hour later someone called from a "Unknown" number.  Again, the caller (a different guy from the first one) asked for "Mason".

Got two calls last night within 30 minutes of each other.  I did not answer the call because I did not know the number.  And no message was left

I got the call today. However I wasn't at my cell phone. The first one was at 2:03 and the second was at 3:01. Everytime I try to call these people back, it says the number is unlisted.