They have been calling 3 - 4 x per day, Anybody know anything about this number? Last time they called I answered and said "This better be important." They hung up.

I know it's a number with an invalid prefix for N. America, meaning it's likely spoofed. Dirty tricks are probable from fishy looking numbers like these. You're best off to ignore the call entirely.

440-057-1983 calls my house several times a day, three times just in the past hour today.  They do not leave messages on my answer machine, so I will NOT answer their calls when I'm home.

This number has called me five times today and several times yesterday!  I know it's an invalid number and I am not going to answer.  It's blocked but I still get that first ring and it's very annoying.