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7.2 Any unused inclusive Applicable Data Value will expire at the end of the Month-a-versary. There is no carry-over of unused inclusive Applicable Data Value.
See "Terms and Conditions apply" right there at the top of your screenshot?
https://www.mtn.co.za/pages/website_legal.aspx?termsID=429
So the answer is... NO!
And remember if you buy it on the 23rd of the month, it will always renew on the 23rd of the month, aka the Month-a-versary