I only want 1 Gig, MTN decide to add extra 2 Gig for R100 extra (to pay for their Nigeria penalty)

I took out a contract at MTN for a Galaxy A6+ on Contract R349 pm x24 on MTN Made for Me M.

The issue is I didn't sign up for additional data!!!!! I went to the store to get the issue rectified without success - I want to be on a 1 Gig data package and NOT1 Gig + 2Gig

MTN is *******ly billing me for something I didn't ask to pay to pay for their ******* Nigeria penalty. I am a pensioner and have to count every cent - when will companies stop being *******?