over charged me on my data usage.

I bought a alcatel tablet on the 17 January 2017 at Bay side Table view which came with a package of R 339-00 per month to be debited out of my account on the 7 of each month. In June 2017 vodacom charged me R900-00 for the month of June but the package deal is 5GB during the daytime and 5GB after 12Pm , i phoned them they told me that i have used all my data and now i was using out of bundle fees that is why they charged me so much money, which is absolutely ******* it is impossible to use so much data in one month, when i did not even put on my tablet during the June month. I have asked them to post me my statement to my physical address which till today, have not received any statement. Today the 10 of October 2017 they debited R 1142-00 out of my account, when i phoned them today they send me from pillow to post without any explanation, i find this disgusting of vodacom to treat their customers like this. I have also been trying to download the vodacom app so i can keep track of my usage and statements it is impossible as, they keep on telling me that they have technical problems and i must try later which never exists. Please can you help me to get my money back and to cancel with vodacom. Thank you Angela Goertz