Consumer Redressal

I have invested in Eros Corporate Park, Manesar, Gurgaon, Builder's name is Ajay ENterprises. My office space is neither selling or renting. Builder refuses to take calls and there is never an email in response to any of my questions. Instead every quarter there is an invoice send for the maintainence fee. I feel cheated by the builder. He is not making any effort towards the owners who have invested their hard earned money. He has no respect towards other people's time and effort. It is a shame to invest with this builder.