Could some unscrupulous businesses as a business strategy possibly be intentionally sneaking on extra charges onto selected customers hoping the customer not notice it? And if the customer does notice the discrepancy such as an unusual charge (or line item) and queries it, simply say sorry, correct the billing error and say it was a mistake?

Been a few cases recently when procuring products or services, errors have been spotted in either the quote or with a given invoice and have usually given the business the benefit of the doubt. I like to think (and still believe) the vast majority of these have been genuine and innocent mistakes, but the increasing frequently of such experiences in recent years has left me to question, is it a possibility that some businesses could be feigning mistakes? Particularly in these more challenging economic conditions?

My concern is that it can be extremely difficult if not downright impossible to determine between what are genuine billing mistakes that any business (despite the best of intentions) could still make and what could be feigned billing mistakes undertaken willfully as a business strategy by less than honest businesses.