vodacom increase contract

I received an email today that my Vodacom Internet bundle subscription will increase the 1st of May 2015. My contract has not yet expired, as it was a contract for 2 years. So according to me, it is bridge of contract. I called the Vodacom call centre for my contract, but unfortunitely they couldn't provide me with a signed copy of my contract. I feel they can atleast give me the option to cancel the contract as they already bridged contract. <br>