You can share inclusive data, the agent is talking kak....36 months is a long time, but doesn't bug me in the least, it is a good deal, would take a year or so before we might see something like MTN choice 200gig or more, needed to upgrade in the next two months anyways.....so either take this, hope it's still available in two months, or take a shittier deal....
What I did today was, to downgrade my other contract to MTN mychoice zero, they keep the sim active, till such time you want to upgrade, will datashare on that, or far as I am aware data share is already active.