BREACH OF CONTRACT

I RECEIVED AN SMS ON THE 27/03/2015 STATING THAT MY SUBSCRIPTION HAS GONE UP...MY CONTRACT ONLY ENDS SUM TIME IN NOVEMBER AND WITH THE NEW SUBSCRIPTION I HAVE TO PAY EXTRAS...I FONED TEH CALL CENTRE AND SPOKE TO MARIE...SHE INFORMED THAT THERE ARE CONTRACTS UPGRADES AND VODACAM CAN DO AS THEY PLEASE ANYTIME...I PERSONALLY THINK THAT, THAT IS UTTER NONSENSE...IF I HAD TO PAY A RAND LESS IN MY INSTALLMENTS, MY LINE WOULD BE CUT..SHE ALSO ADVISED THAT IS IS IN THE TERMS AND CONDITIONS OF THE CONTRACT, I HAVE MY ORIGINAL CONTRACT AND, IT DOESNT STATE ANYTHING THERE. PLEASE GET BACK TO ME URGENTLY AS I WOULD PREFER TO STAY ON MY ORIGINAL CONTRACT AS PER AGREEMENT.