Marriage not consummated, can we go for nullity of marriage?

I got married on 08-June-2017, it was an arranged marriage and bride side has insisted the date which was with in 38 days from the time of first meeting. There were many conversations to know about each other before marriage and later i came to know that what she said were not true. After Marriage i kept receiving messages about her past relationship and her drinking habits with proofs. She is alcoholic and had long term relationship which she has accepted in phone conversation. Bride family has given gold and sarees to her of worth 8 Lakhs, which are completely spent on Bride. She is stating those as dowry now. Now i lost trust in her as she has mislead and still misleading us in every aspect from family background to her past things. She is full of secrets which are revealing progressivey after marriage. Bride spent only 8 days in our home where she started showing her bossy behaviour, She scanned every file in my Phone and started questioning about girls in group pictures and started digging information about property and the share i owe in it. Since 16-June-2017, she is with her parents as i left to Continue my Job in other State. I dont want to continue with her but she is adamant on being with me and threatening me with the cases she is above to file. She initiated a Legal notice alleging me of Impotency, she states that i told her about my impotency right after marriage. In her notice she was demanding to live with her on certain conditions else i have to pay 30 Lakh rupees as alimony and want 20000 as maintenance per month for spoiling her future. Our marriage is not consummated and this was accepted and stated in Bride's Notice. My questions : 1. As marriage is not consummated and the same is accpeted by bride in her notice , Can we go for nullity of marriage ? 2. How to face Restitution of Conjugal rights , if she files the same ? 3. She did her Post graduation , Used to work before marraige.Do i have to give her maintenance ? 4. What would be the other actions taken by her to be with me?