Breach of contract and agreement

I upgraded my my contract with vodacom whereby I used to get 2G of data a month and if it was not used it was subjected to expire after 60 days. I did upgrade it because terms and conditions were different from the old contract, in the new contract I was told that this time the data is going to stay and got piled even after 60 days. Because I did tell the Lady that I am going away where really i am not going to be in need of the data. I upgraded the contract for that reason, when coming back after 11 months I checked the data and find out that there was only 2Gig available, then with a surprise I contacted my service provide{Vodacom}. I found out that Vodacom gave my personal information to the company called Buymondo of which they misled me by telling me a pure lies. Buymondo they do not want to speak to me in order to resolve the issue. I even requested the recording of our conversation as I was told that is going to made available to me upon my request. Now Vodacom do not want to help me to resolve the issue. They take me to pillar to post and it is taking too long now.