No notifications from Vodacom to inform about depleted data

On Saturday, the 24th of February 2018, I got a notification from Vodacom to notify me that I have less the 250Mb of data left. On the evening of the 25th of February 2018, I got a notification to say I have used R103.85 out of bundle data. Nowhere in between these two notifications have I received ANY notifications to say that I'm about to run out of data or that my data has been depleted. When I queried it with Vodacom via email, I got a response that I can only dispute this once the bill run is done. This is unacceptable! If Vodacom can send me proof that they have send me sufficient notification to inform me that I'm about to run out of data or that my data has been depleted, I will pay this, but if Vodacom can't send me proof, then I won't pay this. If Vodacom does debit my account for this amount, I will take it further by going to the Ombudsman and I will take it to social media as well. This is my reference numbers from the Vodacom emails, 003S-SCR4 and 00HM-MHAK.