Antony Projects — after 3 1/2 years sale, still they didn't hand over the flat and eb connection not given.

Address: Chennai, Tamil Nadu

I bought flat in antony project "mont reve"appatrment in 28th feb 2014, till date they didn't hand over the flat & they couldn't get eb conection for my flat, i am a middle class family now i staying in rented house, when ever i visit their office no-one is there to answer except a security person. Now i don't know what to do. If any one have idea how take action this builder you can tell me, because i called mr. Charless& mr. Antony many times & send sms, whatsup but they are not responding. So please anyone have idea how to take action against these people pl let me know.