A Bedfordshire man was sent a letter from insurance company Prudential addressed to Mr A Shagslikeadonkey.
The letter to Nick Mann was signed by the company's marketing chief Andy Lucas
The note went on: "Dear Mr Shagslikeadonkey, Moving your home insurance to Prudential could save about £80 . . ."
Mr Mann, a financial adviser, said: "My jaw hit the floor when I saw the letter. I'm used to hearing from insurance companies due to my work - but I've never received anything like this. I don't even have any Prudential policies."
A Prudential spokesman said the name was put in their system years ago - and the culprit had left the firm.