Consumer Redressal

Sir,I received a call from (01164000283)shopon4u firstvon 24feb,2015 telling me that I got nominated for Tatanano car and I have to pay Rs2499/- for membership for getting the unique user id and password to check the ranking. After making payment, I received lots of calls from Mr. sahil, kunal, Rahul choudhury, Sakshi sharma etc from different no.s 01165029062,01149688922,01165453212,01149688922 etc and they all convinced me to made a payment of Rs 50000/- in part showing different formalities( like car road taxes, insurance etc) for winning the contest. They also asked me to send proof of documents for necessary proceedings to win the contest. I completed all the formalities until I realize financial crisis. On 3rd march I sent them mail regarding refund of the Rs 50000/- amt and also on 3rd march,I requested miss sakshi sharma to refund rupees but she denied and aked me to purchase somthing but sir I dont want to purchase anything frm their site and want my money back.plz intervane.