Breach of contract/ Big ***** up

I received an email from Vodacom stating an increase on selected price plans. I have been with Vodacom since 2011, never seen such practice. I signed a contract stipulating the amount I will be paying in the duration of our contract, now Vodacom goes ahead and add R150 more on my contract without consulting me, which is a breach of contract. <br> <br> To make matters worse, there's no additional features added to my price plan. Can someone at Vodacom please sort this mess up immediately before many customers jump ship? I cannot tolerate this act of bullying, there's many competitors in SA, in-case you think this is 1995.