Mis-selling is described as a financial plague. The document uses an example of buying a laptop to illustrate mis-selling, where a customer is sold a laptop without a DVD drive even though they specified they wanted it to watch movies. Mis-selling occurs when the features or benefits of a financial product do not meet the needs and requirements of the customer, similar to being sold a laptop without the ability to watch DVDs. The document provides contact information for an organization called iSmart Consumer Solutions that appears to help customers who have been mis-sold financial products.