VODACOM Data refill ****

Vodacom R3 10MB data refill **** VODACOM billing me bit by bit by allocating an unauthorized R3 10MB data bundle frequently

Vodacom please stop buying data with my airtime on my behalf. Vodacom keeps taking R3 off my airtime for some 10MB Data Refill which I did not sign up for. The opt-out option is not available on my menu as detailed on Vodacom’s website and the call is non-responsive due to the volume of calls and reluctant assistance. As a consumer, I do not think its fair for Vodacom to make decisions to purchase data or anything on my behalf. I purchased airtime and not data. I am already contracted to vodacom for data bundles, I wouldnt buy 10mb extra for 3.10. Vodacom can you please assist with resolving this issue