Vodacom very poor business ethics

Good day, Vodacom offered me a 40 gig sim only data deal for R199 in March 2019 ending the 6th of March. I signed at that price and in April 2019 they gave me a 10% increase in premium which is now R219 a month. This is with no communication or notice at all. They then proceed to open the same data deal in April for the same R199 as I signed up for.

Firstly how can you need a price increase if you bring the same deal out a month later and keep it at the original price. Secondly there has been no communication and stated in the Terms and condition they have to give you 20 days notice. This is then a breech of contract if they do not give notice.

After communication with a consultant, the answer I get is 'that is just unfortunate sir'

I am very disgusted with the way vodacom has dealt with the situation and the service I have been given based on there very poor business ethics