Consumer Redressal

I am pritom sen,studying in mechanical engg. few days ago a man name bikash mallick (ph no:9250014369)called me and told he gives a job in ashok leyland company thats why i have to pay 2500rs which is refundable...and he continuous disturbed me,then i deposited this 2500.abd i uploaded all my educational certificate on this perticular mail id..and take a interview on phone...after that one message has come in my mail,that i have to paid another 7000 rs for accomodation and security purpose..than i deny it..after that bikash mallick threatened me if i dont deposit those 7000 rs he send my all educational certificate in black listed..then rebuke me...this was happened with my 2 other friends sir,please sir help me..