Reckless Lending and ********** Data Approval

My Acc nr is I***-3 for cell nr ***. In March 2020 I recieved my Vodacom statement quoting me R854.05 instead of my normal installment of R619.16. I went to East Rand Mall Vodacom to query it and they advised I'm being billed for 2GB Data bundles for February and March respectively. I told them I have never received a call from Vodacom offering me additional data on my contract and a query was logged under Ref nr ***. A few days later I received a call from Vodacom confirming they canceled the data and I will not be receiving any more data but they were unable to confirm how it was activated. I just received my June statement and y'know I'm being billed R1047.62 for 3GB Data Bundle top up for the month of May (R173.44) and June (R199.13). Yet again, I have not received or requested changes to my contract and this is causing me to become over indebted. I want confirmation in writing of the call where I agreed or requested Vodacom to supply me additional data on top of the amount that I'm already receiving as per my contract. This is reckless lending and ********** as I never requested additional data and neither can I afford it. I refuse to pay more than my contract installment of R619.16 and I request feedback in writing to *** and *** as I intend to take it further if it's resolved immediately.