I have been scammed, there is no money no profit

I have invested $1000 in their system and after 6 months my account is inaccessible. I haven't received any monthly commission as they have promised to me. And when I asked them why they blocked my account and now I am not even able to login into the system and unable to ask for a refund. They are not replying to my emails as well which I have sent to their support email id.
I am trying to take follow-up for 2 months and now I am completely feeling that I have been scammed. I have lost hope and do not know where to go and complain.