GEMS B School does not offer MBA in Marketing anymore. But if you want to study something close to the marketing field and explore your creative side, you can always join MBA in Event Management.
I think listening to someone who cannot even give his name, doesn't even have his own identity, doesn't make sense. For someone who is fake himself, how can he point a finger at someone else! As far as GEMS affiliation, recognition, foreign degree or recognised in public sector... I think one should visit the campus and see all the certifications, proofs, which I have seen. Its 100% genuine. Don't believe someone just because he has some bitter experience due to his own fault (which btw, i dug deep and found out).