Vodacom Exploiting customers - Wrong Billing and False advertising

So I bought 30GB of data on Vodacome on Monday 12 October 2020 at 25% discount and it is confirmed activated at 07h44 by sms at around R450 using the app. I checked my balances during the afternoon and the data does not reflect. But the outstanding amount owed according the App has gone from R1097.01 to R2215.58 (a whooping difference of R1118.57). I called Vodacom on 082135 and after waiting without answer i schedule a callback by Vodacom. This never materialises and this morning 13 October 2020 I check my App and the data suddenly reflects.But it is now 19 GB as opossed to 30GB + 1.5GB (i had initially). Vodacom is up to something but their service is terrible.