VMC Developers — No updates of my 4 plots at shahpur vmc vihang city

Address: Thane

We have purchased 4 plots in2011, 2 in favour of my name and 2 in favour of my wife name by paying full and final payment of 80000 each total 320000.
I have MOU and receipt of all the four plots with me .
no one is receiving the call on the mobile number i have previously and in the beginning they reply on mails and received the calls. But now no one received the calls nor they reply the mails
Where shall i complain to get back my amount back
In our group we have 15 plots altogether who have purchased in the bulk .
Shall i complain to the police station or is there any online complaint site?