Vodacom business ethics shocker

Took out New Internet contract mid November R499 x36 In Feb I get an invoice for R543. A 9% Increase in less than 3 months. No Success in Vodacom They say they are within their rights, but I can't cancel my contract without penalties. An increase at 3x the inflation rate within 3 months of starting the contract breaks the social contract and means you cant trust their advertised prices. I am now in a broken relationship with the divorce only scheduled for 33 months time. Do they not want any repeat buisness?