1) Deed of Rectification has to be made . area of flat has to be corrected . have rectification Deed duly stamped and registered
2) you have to make an application to society for transfer of flat in your name . enclose copy of sale deed with seller . complete all the formalities . after approval in AGM share certificate will be transferred in your name .
3)what are the vague reasons mentioned by MCD for not carrying out mutation of flat in your name ? you can appoint an agent to expedite the process