Vodacom purposely charges out of bundle rates

I have on numerous ocasions bought additional data for my phone from vodacom. Firstly I. Always have to call them to allocate the data to me that I bought and in the meantime they charge me out of bundle rates. I don't understand how they can bill me before allocating the data to me without me having to call them every time. I also have to call them to check my data balances as neither their vodacom app nor their Ssid system works as it doesnt show me how much data I have left. This service is absolutely pathetic . I will be closing my account with vodacom. I've had enough. You guys are *****ing money from me by charging out of bundle rates when I've bought data.