The problem being this person was:
a) Trying to sign up as someone from a different address last week.
b) Was using an account that was closed, though someone else let them rent yesterday, which gets me sad.
So I know why they're angry, it looks like I have a vendetta against them. Which is now partly true because they're trying to use someone else's card.
Ach, I don't like those situations. They give me some adrelinalin which gets wasted afterwards in the empty shop, heh.