Vodacom is trash!

I have a cellphone contract with Vodacom from 07/08 May 2017. The total monthly cost for my contract was +/- R 816 for two cellphones. I then added another contract for a cellphone which brought my total monthly bill to R1476.74 including vat. Vodacom then sent me an sms NOTIFYING me of an increase in my bill due to the additional data of 100 MB that they are gonna give me. I then called Vodacom to object to this since I never asked for any data increase, especially at an additional cost to me! I was then told to wait and see if I will get billed for the additional data as the call centre agent had no clue what i was talking about. I have now received my bill statement for the month of May and to my horror, It does include the additional charge for the lousy 100 MB that I never asked for in the first place.

I called Vodacom to explain that i have a contract for 24 months which cannot be changed as Vodacom pleases but I was told that it was on the clause of my contract that Vodacom can increase my bill as they wish. I have since went to check my contract and no such clause exist!