It's a collection agency!

They call my work number asking for someone who used to work here.  I press the "4" as indicated to let them know it is the wrong number, but they don't register it.  After 2 times it disconnects.  

constant

constant calls

I'm getting calls from them every single day from diffrent numbers, which all start with 859-963 and the last 4 digitis are always diffrent. They've been calling my phone at different times from Mon-Sat but I keep on ignoring their calls and trying to block all their numbers they are calling from. This terror has been going on for over a month and since I know that I have nothing to do with a collection agency, I have no other choice except to block them!