unsubstantiated price incfrease

My Smart S Top Up contract has increased from R245.22 to R 286,09 (excl VAT).. when this was queried with Vodacom Customer Service on the 10th, I was given a service request no 1- ********** ********** . The following day, Friday the 11th, I received an sms at 06.57 stating that my request was still in progress. At 12.57 the same day I received a second sms stating that " your query has been resolved, visit vodacom.co.za/app". . No explanation ...I again phoned Customer Service and initially was answered by an extremely rude agent who bluntly told me that I had received notification on the 26th of March regarding prices increases, however that sms stated that "in line with VAT and price adjustment increases your monthly subscription will increase......Please visit voda.com/prices2018 for a FULL list of our product pricing' ( This site reflected that my Smart S Top Up would increase only from R279 to R282). The agent basically told me that I HAD been informed of the new price (R329) and when I told him he was lying he put the phone down on me. I again phoned in an spoke to a Lilah who promised to escalate the issue to her supervisor,, Today at 1300 I received an sms to state that my query has been closed. To put the issue into perspective Vodacoms own Standard Terms and Conditions state that they may vary the charges from time to time BUT shall provide us with at least 20 days notice of SUCH variations, and further that these variations shall not exceed the Tariff as published by the Vodacom Group... Apart from this making Vodacom both judge and jury, surely the notice of a price increase should/must be specific i.e stating the actual amount of increase (which did not happen) Sorry Vodacom, but your service is abysmal, and for interest sake where does one access the Groups Tariffs??