Vodacom Breach of Contract

Vodacom Online contacted me telephonically on 6 Oct and informed me that my existing contracts is being phased out and that I need to upgrade in order to keep my contract. I was informed my monthly costs would decrease and that additionally I would also be receiving one handset per contract at no additional cost. Obviously this was all recorded so I have no issue proving it.

However, the next month my contract fees doubled and when I enquired about this the Vodacom started with all sorts of excuses and stories while making it very difficult for me to speak to someone who could actually assist me.

If this situation was reversed then Vodacom would simply play contract contract with me and remind me that I agreed to the contract. So in this scenario of them not honoring their side of the contract - is this then breach of contract by Vodacom?