still waiting for my data, from 01 August

I have contacted the call centre numerous times regarding my 1GB data that I have not yet received. As of 01 August my new package is a data package for 2GB data per month, I have received my 2GB data but the additional 1GB data that was promised to me for 2 years stopped as of 01 August 2015 and was actually supposed to run till August 2016. A few supervisors checked my records and confirmed that the extra 1GB was not supp**** to me though it was supp**** in the prior months. Your service centre sends me sms's and tells me the data has been supp**** to me, but it still has not been and again your call centre supervisors confirm that the data has not been supp****. Please advise as it is quite frustrating to call so often and explain the same thing over and over again to various call centre agents.