promotional bundles

On the 23rd/12/15 I loaded R15 airtime to buy the 50mb for a week, soon after that I received a text saying that I will receive 100mb if I load R30 airtime. I then checked my balance it said I had 150mb. I even dialed*141*1# to get the breakdown I phoned 173 spoke to zanele I explained my story & told her that I don't want the promotional data as I have had bad experience that I will deplete with the actual data or airtime hence I left MTN & I am back because I thought they have sorted their problems she promised to escalate 4 hours later I phoned again because one came back to me as per zanele my nightmare begun technical support hung up on me endless phone calls being sent from pillar to post I was even told that I am seeing things by mdu from technical support. I need to know what happened to the TNT? I never gave back service when I worked for MTN I starved to meet our customers need... till nou I am still waiting & the 100mb has started depleting