FALSE Advertising - Not getting what I was promise

I have been a long time subscriber of 8ta/Telkom Mobile and is on a Smartplan 100 that included 5GB of promotional data. After 24 months, I was billed for the 5GB of data and my bill jumped up to almost R500. Then I phoned Telkom on 180, and they told me if I want to be credited for my 5GB of data I should renew my contract and it will continue as before. Meaning that I will get my 5GB of data and will not be billed for it. I went into the store on 14th of December 2015. To renew my contract. At the same time, I was informed that the sim card only option for R99 a month also includes an unlimited promotional data package until end of March 2016. Then 2016 January came, I used up my 5GB of data, and no unlimited data kicked in as it was supposed to. Then my bill came in at R483. I phoned Telkom Mobile on 180 and logged a call ***. They said 72 hours it would reflect because they could see I renewed my contract and I will be credited. Yet today I am informed that the case is still open. Today I still have no unlimited promotional data. I am being billed for 5GB of data and I have no data! And I wasted R100 on an upgrade fee and compulsory R100 new sim. PLEASE HELP!