Breach of contract and robbing me of my data

I app**** for what they said was MTN home 100gb which in total would be 120GB for R269 per month to my surprise I'm put on a made for me home 30gb and getting less than 100gb for that R269. I have called more than 15times since May and I have been informed that all agents who logged my complaint did not put the right information. I was referred to mondo and they are also useless they did not reply to my emails. MTN is robbing me and I want to all my data due to me. When I check my balance even the promotional data is less that what the contract stipulated.