sort of reminds me of the day that they sent my mum a letter saying she had been over paid 1.5 million dollars :rofl she said "umm well if you overpaid me that much I wouldn't still be here"... quite funny really. Apparenly it was the date "15041996" put in the wrong spot haha She still has the letter.
Oh Heavens, I got that once! I went in to tell them I was married and get my name changed, and the woman wiped out 6 years of defacto history. I went home and checked my online after I did that, and I had nil payment and bills up the wazoo. Called them straight away and some other poor woman spent 2 days manually re-entering ALL my data to fix it!

When they make a mistake - its always a doozy!