A woman was getting swamped with calls from strangers. The  reason? A billing service had launched an 800 number that was identical to hers. When she called to complain, she was told to get a new number.  

"I've had mine for twenty years," she pleaded. "Couldn't you change yours?"  

The company refused, so she said, "Fine. From now on, I'm going to tell everyone who calls that their bill is paid in full."  

The company got a new number the next day.