Telecom's billing systems are a huge and complex beast at the best of times. However you would like to think that the simple things like arithmetic are done correctly.

The following is taken from my recent Telecom account at work. You would like to think that a company that sends out hundreds, if not thousands, of accounts each day has the processes in place to ensure they are accurate. How many other customers have had these sort of mistakes made but don't have the systems in place to capture and attend to them? How much additional money has Telecom earned through these mistakes? How can a user expect such an organisation to manage a complex telecommunication system when it doesn't know the difference between addition and subtraction?