Vodacom call centre agents have gone very rogue

Many months ago, I renewed and upgraded my data/voice from 2.4GB/200min to a 1.2GB/400min package. This is what was sold to me, and it suited my needs of more voice time. Then came activation day, all I got was 1.2GB/300min, a handful of calls after that the issue went unresolved. Each time I call, they would not give me a case number, even when I asked for one! Months later, now in Nov, one agent came to my "rescue", and sold me an additional 100min to make up the 400 I have already signed up for, that I never got. Then came today, 1st December and all I get is 1.2GB/200min. I am tired of calling, I have a life to live without explaining and pleading, to be sold a dummy, if not dummies. Has anyone experienced this?