Jet Airways — fake offer or real offer?

Got a message from jet airways stating that my profile is being shortlisted for the airlines and they have given a number and asked me to call them.. So i called the number and spoke to a lady.. She said my profile is shortlisted for jet airways and asked me in which department i wanna work with, i said anything other than the cabin crew so he selected me for air-ticketing. Then she asked me to transfer 2000rs for registration and it will be refunded if i dint get the job.. And i had my aptitude test that day evening after transferring the money and the telephonic interview the next working day.. And after that they sent the job offer letter through mail signed which i've attached below, and is asking for 7500 rs for security verification purpose which i still dint transfer.. I just want to know if it is fake or real..