What companies gave you such bad customer service that you will never give them a dime again?

Wendy's... when I was in line waiting for my order and 'Latisha' was asked by another employee where Terry was, and she replied "He takin' a s**t". The other employee then reprimanded her for saying that out loud that all the customers heard and she shrugged and replied "Everybody do it". I have not eaten there since.