****** Vodacom Data - Contract Phone

The past few months I have to buy extra data bundles despite the fact that a 1GIG data is part of my contract. I never had to buy extra data - but all of a sudden data get used up for no explainable reason. I've received a sms on Sunday, 20 August 2017 that I've already used a certain amount out-of-bundle data, so I've immediately purchased an extra 1GIG for the amount of R149 and received a confirmation sms saying that I've purchased the 1GIG data and that an amount of R149 will be deducted from my account. Today I've received another sms saying that I've used more than R340 out-of-bundle data. After querying it, I've been told it doesn't show that I've purchased any additional data despite the confirmation sms. Where is that data that I've purchased? And what will happen to the "out-of-bundle" rates amount already billed to my account? I was under the impression after receiving a confirmation that the bundle have been purchased that I am using my 1GIG data bundle. Vodacom data going missing is not only Top-up or pay as you go clients.