Unauthorised charges on accounts

I would like to raise my concern regarding the contract i have with Vodacom. Every year my laptop contract gets amended and data and munites fees are charged, which i did not request, last year July, this was reversed and no one could tell me who changed my contract. The same thing is happening again . Now this makes me question the transparency and integrity of this institution. How on earth can someone log in your systems and change customers contracts, add charges and no one knows who did this. I want my money back and i encourage all Msanzi people, please do check your phone contracts statements item by item, we are being ****med here. This has been happening for long and people benefited on our hard earned money. Vodacom, i want my money reversed, this dishonesty must end.