Increasing subscription fee within contract period

Vodacom letter dated: 01-04-2015. Fee increase from R99/mth to R109/mth. Contract package: MBB 24 Month 2GB.<br> Yes, that is my contract since Sep-2014, barely 9 months old and still 15 months to go, to fulfill 2 years. Sad part is, from the beginning I paid R109/mth, not R99/mth, as stipulated in Vodacom's letter, but with the increase of R10/mth, my R109/mth went up to R119/mth on the 3rd of May 2015. Can someone from the Vodacom directorate please explain this to me?<br> Further, to change the contract while it is active before expiry of the same, is a breach of contract, and with their letter, Vodacom is in breach to probably millions of South African subscribers. Quite an ******* undergoing. Does Vodacom possibly want to make an announcement in this regards? Perhaps publicly, like a real man, any Chief Executive man enough to do so? Well, the Vodacom letter was not signed by a person.<br> Sincerely,<br> Dan Schilling<br> Dipl. Ing. FH, VDI, Hartbee****rt, South Africa