Charged for 1gb data bundle and only getting 500mb

Hi <br> <br> in 2012 I added a 500mb data bundle on my Vodacom line at a cost of R149 per month.<br> 10 minutes ago I called Vodacom to cancel the bundle as I was under the assumption that I had more than one loaded. the pleasant lady who helped me informed me that I only had 1 bundle loaded, the original 500mb bundle. She then told me that the price had changed from R149 to R99 somewhere in 2013 - so for almost two years I was paying R50 extra for something I wasn't getting.<br> I am very unhappy about this, you would assume that a corporation the size of Vodacom would have the common sense to update the pricing of the active bundles, but no, instead they happily go along taking their customers money<br> NOT very happy about this