FALSE ADVERTISING and PATHETIC CUSTOMER SERVICE!!!!!!!!!!!!!!!!!!!

I have recently done an upgrade with Vodacom on the Vodacom app directly. I accepted a deal, which they confirmed via email and now they want to change the deal price per month claiming that the deal was advertised in error and will not be honoured. Of course, giving me the ' T & C's apply' speech. Now giving me the option to either cancel OR pay the new price , just like that! How can this be allowed? How is it my fault as the client that they have advertised the incorrect price. They are really becoming a pathetic service provider! Surely I also have rights as the consumer, they cannot just decided that their deal is now no longer valid AFTER they had confrimed and even delivered the device and then simply say, OH SORRY we made a mistake you have to PAY or you can CANCEL. They clearly do not even care about retaining their clients! At this rate they WILL be out of business in a few years with thousands of people left unemployed!