Jet Airways — Tripsta.net and Jet Airways scammed me

I'm a normal passenger and I booked online ticket from tripsta.net from Dubai to Kuala lumpur. The flight was on Jet airways and has two stops in India. I made online check in and when I went to Jet airways counter in Dubai airport they told me that I couldn't travel if I haven't Indian visa because one of the flights is internal Indian flight. I haven't the visa and I didn't imagine that visa could be required for transit purpose. tripsta.net didn't show that to me, and even jet airways didn't request it in the check in. I brought a round trip from Dubai to Malaysia, Why they show to me a trip that requires other country visa and they even didn't tell me! I traveled to Malaysia on another airlines. But now I'm shocked that I could't use the return of my first ticket! BTW the return has one stop only and it doesn't require any other visa! I contacted tripsta, they told me that I couldn't use the return flight. I requested refund .. they told me the whole the ticket isn't refundable. but they didn't mention that also in any place! I want my money back. I have been scammed!