Over charged and Bad service

I have been a client of vodacom for 10 yrs and there customer service sucks. Why if you on corporate should you be punished went to upgrade as i am almost due and upgrading my contract to a bigger one so the Jade at the tygervalley branch was more than willing to help and said all i needed to do was pay a R150 in as i am a bit early. So i drove in got there around 18 30 again Jade was very Friendly and helpful he was just struggling to get hold of corporate .I then told him no problem i will come back to fetch the upgrade as everything was arranged. The next morning Jade was off so i dealt with a different employee who now in turn told me i cant upgrade as corporate does not allow premature upgrades anymore surely it is necessary to train staff any important information like corporate cant premature upgrade rather than them helping customers only to look like idiots and then having to tell a client sorry we cant help.And then they have been billing me for BIS on a S4 for 2 the lady phones me and makes as if its my fault says she needs a letter when i cancelled it yet jade cancelled it within a min.So instead of R1400 i get R180? Really twice i get punished for your incompetence.