Mtn false advertising and ****mers

Hi I'm leander ngwenya was with mtn more than 5 years did upgrade on Saturday on 16 at trade route mtn for offer of a 70GB comes with bonus data of 30Gb ruby anytime price of R330 as an agreement (contract)on the following day I receive the data of 70GB only then I returned to the shop to rectify the matter because according to the deal I should get 100Gb value of R330 instead they loaded 70GB they logged the complain with ref:*** then on Tuesday they load the data that was missing 30GB with Ref:*** but now the problem the pricing is no longer according to the contract it went up is now R359 I felt that mtn ****med me also what they advertised is not what they offer false advertising did call them also went to the shop no help please know that mtn become ****mers what they advertised is not what you will pay please any one can help? My number is ***