No cancellation has been done!

Several times I complain about this issue of the 1 gig recurring data bundle of R129.57 exclusive vat is added to my account and Nov. 2018 an amount of R86.38 exclusive vat is added to the Dec. 2018 account.. When I query this they said it's a option I selected when I buy data/airtime and my question is nothing else could be done on my account without me the account holder so how can an option when buying data select an amount to be just added to my monthly account?! How save is it then to use the USER FRIENDLY AND EASY TO USE OPTIONS FROM Vodacom. It appear to me it's not save at all and I am getting tired following this query up the whole time every time and it will be good for a month of 2 and all of a sudden it appears on my account again.. As a Vodacom customer this is not exceptable to me and cause inconvenience and frustration to say the least.. I am on pension but it doesn't mean I don't have my own things to do instead of sitting and waisting time. On vodacom accounts