No question – you need legal help on this. Too complicated for even the Piggs here, I’d say. When one guy says you can ignore the bill collectors and another guy says you may have signed some document that makes you liable, then you need professional help.
I’d recommend calling some law offices that specialize in something other than this and ask them for recommendations of good attorneys that do specialize in this. I don’t even know what “this” is.
Very sorry to hear you have to deal with this. Best of luck.