Price increase

I currently have 3 contracts with Vodacom and received an email saying that all 3 prices are going up!!! Of particular concern is when I called to cancel one of my contracts when it did expire their retentions team decided to reduce my subscription in order for me to continue with a 24 month renewal. Now that price has doubled according to that email. when I called in to cancel my contract because of this increase I was told that I would be charged 75% of my subscription for the remaining term of my contract! Surely this is highly *********. The consumer cant change the terms of the contract at will yet the service provider can? I will be taking this issue up with ICASA and the National Consumer Commission. If you want to change the terms of the contract then I can surely cancel that contract without any penalty particularly 75% of a subscription that has just been doubled which I wont even make use of? How can you justify that as fair? Do you think i pay less if of a subscription if I have a dropped call? I am tempted to cancel all of my contracts at the moment and never do business with a bunch of cheats again. If dstv or bank rates go up I can just cancel my account!