Poor service

About 2 weeks ago I upgraded my contract with Vodacom then the lady said they no longer give data bundles and asked her if she can add an extra 20gig on my contract and she said yes that’s possible but I will be charged extra for the 20gig and I said yes that will be fine and she then said it will be affective from the 1st of September and today is the 2nd of September and I still don’t have any data and when I called them they said it was never added. I need feedback urgently as to why it was never added cos when I call in the consultants have no clue to what I’m saying.