Vodacom *****s my airtime with R3 Data refill bundle

Vodacom continously deducts R3 for 10mb data refill bundle without my authorization. I have deactivated countless times but to no avail. They give 3 options but no cancellation option!?? Even when i choose the 49c option, the lowest ..it still deducts R3 for refill...stop *****ing my airtime! I call it theft!!! Ive tried numerous times to Opt Out but its a ****! I am fully capable of purchading data on my own. Who gave Vodacom the right to deduct from my airtime. I have NEVER subscribed to a refill data bundle! I wish theywould stop *****ing my airtime PLEASE!!!!!! I am at my wits end!