Vodacom be careful with out of data bundle rates airtime used in lieu of with no permission

I am very angry with Vodacom, I keep having to turn my mobile data off to avoid using out of bundle airtime, if I do this then I will not get my whatsapp messages, a clever ploy on their part. The out of bundle rates are ********** and use up any talk time I have that I keep for emergencies. There is no another way to to stop this nonsense, so be very careful when thinking about joining vodacom there is basically no choice stopping out of data bundle usage