Who called from 4255871012

Caller id says "Green Services". Called my work office. Did not answer...

debt collectors...uknown name

This number keeps calling me and they refuse to leave a message.

i actually answered when i received a call from this number, and a woman instantly said "sorry i have the wrong number".

this number shows up frequently on my caller id.  it shows up as "Green Services".  today they called while i was here but when i answered a woman's voice instantly said "sorry i have the wrong number" and hung up on me.  i called back with my cell phone and got a recording thanking me for calling back and to push 1 if i wanted to be removed from their calling list