If it's beyond SOL, don't even worry about it.
We had a debt collector send my DH a DV on an old acc't of his, after *I* asked for one on *my* account. Apparently he had a debt with them 11 yrs ago, and they cross-referenced the names, addys, or something, and tried to get him for that debt, too. He told them to eat it... it was his ex-wife's bill, anyway.