Is VODATA sneaky trick part of VODACOM>

I am always happy with Vodacom service ..but. Is VODATA part of Vodacom? I get VODATA adds on my phone, blocking me from doing anything else unless I click on CANCEL or OK for an adverti*****t to partake in something that will cost me R5 a day etc etc etc. Games or something. I usually have to press CANCEL 4 times or more for the add to go away. I guess OK will only need one click. Is it even legal to make it so difficult for a person to decline an offer? What would one click on CANCEL not suffice?