Going back on what was promised

At the end of June I wanted to change service providers , I had a very bad experience with Vodacom and didnt want to upgrade with them . On the 3rd of July 2024 I received a call from Verhasney in the retention dept , she was a sulervisor manager. She asked me for the reason why i want to switch. After good service I decided to stay with Vodacom . In my new contract I was promised an additional 10gigs of data for my my whole contract term of 36 months above my 2.6gigs of data every month . Only to find ou 2months later that this is not the case . Ons the 2nd of Sept I phoned Vodacom to query this and for them to investigate this . I received a ref number and was told it can take up to 5days for my problem to be resolved . Vodacom ***. Till today I have receibed no feedback. After confirming allthe terms and conditions on numerous occasions during my call on the 3rd of July , I still not received what was promised .