Lol
Sign a contract and then complain when you break it
Ok
Oh please - how many people read the small print when they buy a car? And if I recall correctly, the terms and conditions didn't allow for this "15%" extra to be charged. They could void the entire service plan, but then they would lose the customer. And like I said, Delta stopped doing it because clients got annoyed with them.
But I'm glad you are perfect and adhere to all small print in every contract or sales agreement you sign...