How do i take possession of mhada plot

Hello All, I have purchased a MHADA plot from the owner 20 years ago. I have the registered stamp duty and all other documents. Now i need Possession from MHADA. I have taken a Power of attorney from the owner and registered in the registrar's office. The problem is the offiials say that we need the owner for possession . But the owner is not in India now and is unwilling to travel as he has already provided Power of Attorney. Kindly guide me how to proceed further, i am in deep trouble regarding this and will really appreciate your advice.