Bharti Axa Insurance Policy — Didn't give my policy document and don't even allow to cancel my policy

Address:

Mumbai City, Maharashtra

I was give a policy almost 3 years back and said that the logging period for it is 3 years and after that if you wish you can withdraw the amount and was even promised that i will get get some good amount in returns as my money would be inversted in market but when I tried to withraw the amount firstly they said that i can withdraw the amouint but I will only get 60000 and I have paid 90000 in 3 years and since they had never mailed me my ploicy document they say I have to apply for duplicate copy and only after that I can cancel the policy and get aleast 60000 and the duplicate copy was suppose to get in my hand witin 15 days now its been 2 month I have not yet received the duplicate copy nor i can cancel the policy and when been contacted them they say we are still looking into this matter.
So please help me how can I move ahead in this case.