We received the same call... someone coming to serve me papers tomorrow -- said to call this 855 number.  They called themselves ACS.  

My wife recieved a call from unknown number,  the guy says his name is greg parks and is going to serve papers to me on monday.   Then he said to call this number 855-789-4959 to resolve this matter.  Idk if these guys are legit but the business is called American Check Services and they are not part of the better business bureau.
I have read that its a scam through many other numbers,  so I figured this should be reported.