Incorrect Billing due to contract activation

During march 2015 I have taken out the following contract: R329 pm for 100 minutes, 200 sms's and 300 mb data. My data bundle was not activated and I have been charged a ridiculous amount on my bill every month for mb's that should have been part of my contract. <br> <br> I have logged numerous calls, went to stores and called the help line just to get that sorted (some call ID's: ***, ***, ***). My data bundle has been activated after my previous call, but I am still waiting on a billing adjustment. Today I did a follow up on Req *** which was logged on 18/08/15 just to hear it is still in progress? Meaning in a months time you have not responded to my call regarding the billing adjustment?<br> <br> It has been 7 months since I have taken out the contract - where I have paid my bill on-time but did not receive the full service. Really not acceptable! Please advise.