This is almost the same thing happening to me. I'm glad i made it to this website and see that I'm not alone here. They (the collectors) were saying they were sending me proof of my debt to an old address where my cousin lives, it has never arrived. When I started to get calls about papers being served I got a little concerned, i feel dumb about that now. But i ended up giving them my current address, so that might bite me in the [***] later. I just won't open the door when someone I don't know is there haha. The debt they want is from 2005. Its crazy.