Rubal123456789, First of all congrats on receiving an offer.

Secondly, If you have received an offer for MBA, there is no reason academically why you cannot receive one for MMA except if you are 3 years + experienced. MMA won’t really make sense for you. I doubt they will just convert the offer to MMA but there is no harm in trying if you wish, you should write your query to the Adcom. You can definitely ask for more scholarship but again to get the offer revised depends on how interested are they in keeping you in the program. Revised offers are not common. All the best!
Rubal123456789, Could you please also add school on your profile with the current status as admitted ?