Is It *******

Good afternoon, I've just received a message from Vodacom, my cellphone contract supplier, with a statement saying that as of next month my bill will be increased. Surely this is ******* in the middle of a signed contract. It infuriates me that they can do such a thing. Also if I wanted to opt out of this contract because of the increase I would also be charged.<br> <br> What does Vodacom have to say about this.