Account Query - Increase without Notification

.POOR service from Vodacom, my account was increased by Vodacom after we signed a 24month contract. How can this be right !!! A contract was signed for 24months, no notification was sent to advise me of the increase.<br> <br> After 10 plus years of service i am truly disappointed with Vodacom and wish to cancel all my contract with you.<br>