False advertising and call centre ineffective

I took out a smart plan 100 contract out from telkom mobile under the pretences that I am supposed to receive free mobile data from September 2015 till March 2015. As a few weeks passed and my mobile data ran out I realised that I was not receiving this free data as I was promised. The only reason I took out the smartplan 100 instead of the smart plan 50 was because of the free data. I logged several calls through the call centre as instructed by the branch and the answers I received came down to agents not knowing about this benefit and agents instructing me to just buy data eventhough I was told I should get it free till March 2015. After about the third or fourth call a agent finally logged my case and instructed me to wait 72hours which is the turn around time. A month passed and I received no response and when I called an agent just said they will add a comment on the case as they could see a technician opened the case but did nothing on it. Then I called again and a agent added another comment, and I called again and a agent told me the case was logged incorrectly to the wrong dept and thats why I never got a response, so he logged another case. So basically I am still waitin