Why am I being charged for packet switched data?

<p>This month, there was an added R243, 83 added to my bill for Packet switched data. What is this and why am I suddenly being charged for this?</p> <p> </p> <p>I've been with MTN for almost 15 years now and have never had problems with them before.</p> <p> </p> <p>I appreciate some feedback</p> <p> </p> <p>Hannelize Lombard</p>