Vodacom false advertising

Got an upgrade for my contract in May as my contract ended. Told to be an amount of R249 and debited a different amount. Now tied down to a contract for a value I didn’t agree on. Called in to ask why the difference occurs only to find out the consultant signed me on using the exclusive VAT pricing to make it look like I’m saving. Can’t cancel because of cancellation fees. I can’t believe that such a big organisation will **** people like this!