MTN DOUBLE DATA
What is know is; One can only enjoy double Data offer in two ways.
1.
MTN DATA4ME: you can check whether you have this offer by dialing *121#. Note! Not all packages from the list are double offer. When you're lucky you see...and most this offers are time limited. After some while (say 6 months), them gone.
2.
MTN TUESDAY AWOOF: on every Tuesday of a week, every MTN user is eligible for double data when they purchase from the MY MTN APP. e.g. 2.5gb + 2.5gb for N500 only.
I can see you posted this question on 23rd Dec. Which was Friday. Double data are not available on Fridays unless from *121# lucky offers