They said 'You've been a very naughty girl, haven't you?'
They had, in fact, phoned up completely the wrong person - she has never owed any money to anyone. She has a very common surname but they were looking for someone with a different initial and different address . But still felt able to berate her on the phone and it took her a while to convince them they had got the wrong person and that they should not come round.
But even if someone did owe them money, how f*cking DARE they talk to someone like that? It's just so creepily threatening.