Illegal construction in my house

There have been multiple instances of illegal construction done in my backyard by first floor owner of house. I am the ground floor owner of the house.This amounts to an illegal encroachment of my open area (~ 10 feet outside my kitchen and ~ 3 feet in the balcony). The construction is causing me lot of inconvenience and blocks my sunlight, ventilation and open air. The process of erecting the structure even caused harm to my existing walls and causing seepage, that also made me suffer monetary loss. Needless to say, this expanded structure is not permitted as per the original builder plan. I have raised it with my neighbor on number of occasions, but neither has he taken any action to halt or demolish this construction, nor has he given any positive response to my concerns. After due consideration, I served him with a legal notice on 30th August, asking to demolish this construction in next 30 days. But he has still not halted this construction and proceeding with it. I tried registering police complaint, but they say its a civil matter and they cant help much until there is a court stay order. What should be my next step? Should I make complaints in MCG? How much does it typically cost a lawyer fee for securing a court stay order for further construction?