Those affidavits are not worth it as toilet paper let alone something that can actually stand up in court. For one, it is hearsay and like stated before this person can't possibly testify to personal knowledge 9without commiting perjury).
It doesn't matter if they attempted to sue you before, it is still out of SOL...though this time be sure to motion to dismiss with prejudice, so they can't sue you again. You honestly should have done this the first time around since they had no proof the debt was yours....