Data bundles just disappearing

<p>On 11/11 I still had 4.3 GB on my internet data bundle left. I went on the internet for about a couple of minutes and left the wi-fi router on. About an hour later I returned seeing that almost 2.3 GB has just suddenly disappeared. I contacted Vodacom and they said they will look into it. It is now 18/11 - 7 days later and nothing. Not a word from Vodacom and my disappeared data has not been returned to me. The reference number they gave me S3-GBB3K-K7QYC. This is a new 2 year contract that has just been upgraded and I am already experiencing this kind of treatment?</p>