Just had a cold call telling me they had a cheque for me for wrongly paid bank charges. They asked for me by name and knew my address.
I was polite, because they are just doing their job, but when I didn't want to confirm my address I said 'but I haven't paid any bank charges' the response was 'then why have you been listening? You are just a selfish woman, you just want the money, you could have just hung up'.
On a cold calling rudeness scale it's mild, but really what is the need to be so rude!