Data bundles not being used in the correct order..

I'm absolutely livid at Vodacom's sneaky, dishonest and quite frankly ******** behaviour over the last few months! It all started back in March 2015 when my 3GB monthly data contract bill suddenly changed from R169p/m to R208.50p/m without any explanation for the increase. Then in July I noticed for the first time my leftover data bundle from June was not being used up before the new bundle as has always been in the past. I immediately check their terms and conditions and saw that in fact old data bundles should ALWAYS be used before new ones. Seeing that others were having similar problem I thought I'd spare myself the misery of queuing over the phone or in-store to rectify the problem as it must just be a technical glitch that would sort itself out. It never did. Now on the 1st of August my new 3GB was reflecting on my balance, but unbeknown to me was not being consumed at all, instead every MB my phone was using was being taken from my Airtime!!! I now have no airtime - R100~ was used for a few measly MB worth of data when I happily thought I had a whole 3GB bundle at my disposal!!! Now I suppose I will have to spend a whole day in-store grovelling to this evil corporate giant!!