Airtime Vanished with No Reason

I bought airtime worth 275 a few days back, I made a couple of calls and subsequently had an airtime balance of +200 as of yesterday. When trying to make a call yesterday afternoon I found that I had insufficient funds to make a call. I called customer service and spoke to a lady by the name of Portia. I lodged my complaint. She then said that there has been an airtime adjustment on their system but doesn’t know why that is the case. She gave me a call back 30mins later only to tell me that they still cannot see why the airtime adjustment was processed, and that her supervisor had escalated the complaint to the back office. That was over 12 hours ago and still no response from Portia or Vodacom. Added to that still no airtime. The airtime was no advance and bought with my hard earned money. Sick of this service from what is meant to be South Africa’s biggest network provider.