Vodacom allowing subscriptions to take consumer's airtime without the consumer's consent

My mum's airtime was being eaten up every day and it was unknown as to what is the cause as she did not subscribe for any subscriptions. When we dialed *135*997#, we realised she was subscribed to about 3 things that were foreign (RTST, Baseplay Max and Exploreapp). We digged deeper into the messages and saw that sms's were sent where its free for 1 day and thereafter you pay a (~R15 or more etc) PER DAY. To unsubscribe, you have to click on a link. Sometimes you dont look at your messages as you are busy and look at it the next day or two. I am surprised that Vodacom is allowing such sms's/subscriptions to have access to their customer's airtime/money where its is taken without the consumer's consent. A consumer has the right to choose their subscriptions and not receive a sms and have a timeline to unsubscribe for something that the consumer did not even subscribe for in the first place. This makes one wonder, how safe your airtime is with Vodacom as it can get depleted by Vodacom allowing sms's subscriptions to have access to your airtime without your consent. We will now be moving away from Vodacom.