Don't be bluffed, MTN Data Bundles continue to expire after one month

I use a pre-paid phone. After all the hype about data bundles no longer expiring, I decided to purchase more than usual, buying a 6G bundle for R399 on 5 April 2019 only to find that one month later on 6 May 2019, after using only 3.29GB as per my usage monitor, the data has expired. Who is kidding whom? Why doesn't this not work like airtime which doesn't expire? Surely this is contrary to the spirit of new legislation? I think ICASA needs to be approached about this too.Come on guys it's time for class action!