Vodacom online billing is *******

First I buy a 5GB Bundle on my Vodacom app they mention that it might not show in my data usage so I use a bit and buy another 5GB just to be safe, the app mentions the same thing a I think all is ok so I continue using my data the I buy a third in the morning and that suddenly shows on my app also now I have a R900 extra bill for the data that they did not add, I log a complaint and nothing happens, 2 weeks later I migrate my package to the Red VIP and they told me it will be active only from April by suddenly it's on my March 24, 2016 Bill ***, the lady now tells me it's a proposed bill for April ***