Tabster, if it's worth trying, to get contact info out of them you could say "If I meet a Mrs. Clements, how should I tell her to contact you?" That way you're not under false pretences.

I assume from the callers' attitude that they think Mrs. Clements owes money and is trying to hide. I wonder if the time-share or whatever, which originally had a business relationship with Mrs. Clements, gave up trying to contact her and passed the job over to debt collectors (who may not have a reputation to lose by being impolite) in return for a percentage of what they might collect.