Data expiry dates and no notifications

I would like to know why my data that I am purchasing still has an expiry date. My purchase of the 11th August 2018 is only valid to 9th September 2018. I have not received a single notification that my data is being depleted. Since ICASA in April 2018 directed service providers to no longer allow data to expire and to notify customers in decreasing percentages of the depletion of their data, I want an explanation from Vodacom why this is still happening months later. Data that I have paid for is still disappearing ...