well darn it lucky- they just keep coming huh! sorry to hear you're dealing with this again.
i was surprised that my summons did not include an affidavit or anything. then I went to the courthouse and found that one was in the file. whether or not they have to attach one, i dont know. but it seems to me that if they don't, you've got an argument for failure to state a claim for which relief can be granted.
I would definitely assert that as an affirmative defense, as well as SOL.
as far as how you respond to the claims in the complaint, i'll leave that to the experts!
