They said they were National Process Servers.

Got a voice mail from this number saying a "civil complaint" had been filed on me and me or my legal representative needed to call them before further action?? Said they were Davis or Davison and Associates.  What the heck?

Ah, yet another bunch of losers trying to scam you out of money!

Does anyone know if a debt collector can file a "civil complaint" on someone that defaulted on a debt over 10 years ago?

Same thing as every one above.  They even gave our new address and said they've verified employment.  Said they've sent us stuff in mail six weeks ago - NOT received anything.  Statutes of limitations has run out on any debt needing to be collected after 5 to 6 years --  these guys are calling for thing well over 10 - time has run out.

Definitely sounded threatening.