MTN *****ING MY DATA AND STAFF TREATING ME LIKE I DON'T KNOW WHAT I GOT

I took an LTE contract specifically because I am supposed to get 30gigs og Youtube data a month. I noticed today I did not get it. Spoke to 2 agents, they refuse to give a supervisor and they insist that I must only get 10gig. The more I say that's not right, the more they argue with me. Even on my MTN app, it shows I should get a minimum promotional data of 20gig. Now I must drive out to the point of sale. What ****. DON'T TELL ME I DON'T KNOW WHAT I AM SUPPOSED TO GET ON THE PLAN AND STOP CHEATING ME OUT OF MY DATA. I HAVE SCREENSHOTS OF WHERE I GOT 30GIG OF PROMOTIONAL DATA FOR YOUTUBE. GIVE ME MY F-ING DATA!!