i read this
article that shows the most common billing errors that many credit card companies end up doing, and it does cost billions of dollars year to the consumers!
i love this example taken from the article, "Many bills contain inflated charges for products and services. An example is this New York City waiter who added a $10 tip to a dinner bill charged on a customer's credit card. The cardholder noticed this mistake and asked the restaurant to correct it. "