Think people in customer service are powerless to your ranting or abuse? Maybe not, depending on how badly their billing software tracks changes to customer profiles. From the ABC article:
... But when she got her August bill from Comcast she had no trouble understanding she'd made somebody mad. It was addressed to "Bitch Dog."
"I was like you got to be freaking kidding me," said Govan, 25. "I was so mad I couldn't even cuss."
In another case, Peoples Energy customer Jefferoy Barnes started getting letters addressed to "Jeffery Scrotum Bag Barnes."