Data bundles charged multiple times

I had a problem loading data bundles in April. The Vodacom app allowed me to load the bundle but the available data never changed and I never received an SMS notification. I them tried the USSD option for loading a data bundle and also never received a confirmation SMS.<br> <br> The next day, I received 3 notifications of a 1GB data bundle being loaded and called the call centre to advise that this was in error. The two additional bundles were supposed to be credited (agreed on the call with the call centre agent) but have shown up on my statement.<br>