Millennium Freelancing Services — even after my completion of my work my id is blocked and no money

I have completed my work on 6 th august 2019, and then they said u ll get ur report within 48hours and v ll call u aftr tht for payment but aftr three days whn i tried to login they hv blocked my id and whn i called them they said u hv to pay 4000 something to unblock ur id and thts all #. If i hv completed my work thn whts the purpose to block my id. Its a fraud company so every1 kindly beware