Debt collector reaction LoL

[wiking]

My father had some time ago refinanced his affairs which included a credit card debt to ANZ bank.

Now some 2 years later out pops a debt collector who alleges to have bought the debt from ANZ
They sent a notice of collection etc, I read the notice carefully and judging by the wording and who
to contact for payment etc decided they are a third party interloper.

So I sent them a notice, noticing their notice and accepting it for value upon proof of claim.
Such proof being a proper contract with their company stamp and representatives signature
along with my Fathers.

They rang up my Dad today about the notice we sent them. The guy just rambled on incessantly about
how its only fair they get paid and responsibility blah blah blah. No mention was made of any proof
they might have or anything pertinent. Instead of threats it was a big sob story of how offended they
were and unfair we were being LOL

Now Im not one for trying stiff another business who supplied something real and tangible, however when
the origin is a so called 'credit' debt ( which is an exchange of promises ) AND an interloper they are fair game.