Tech Mahindra — fake offer letter

I received a offer letter saying my profile has been selected by company out of 128 candidates in which the requirement is 28 posts. I received it thorough phone message and mail. They asked me to pay 1000 rupees, which is the security amount and in that they insisted that it is refundable during the time of recruitment and the gate pass will be sent through courier. It had proper bank account with the same company name. After sending the money they send offer letter saying that i am selected and in that it was like they further asked me to deposit for selecting the post, at that time i realised that it was fake.