Empty promiees

Vodacom used my new data bundle first and 800mb of data on my older bundle expired. Then over R60 of airtime was used for internet. I phoned the call centre 3 times and went into the vodacom shop which took me over 2 hours just to be told that they dont know why this happened, i then asked the call centre agent if i could speak to someone that can help me because they were wasting my time then they put their manager called Arno on the line who told me that he would send a request to vodacom to refund me because i was never explained that this is the way that vodacom works. It never happened and ive had no feedback.