Jet Airways — refund of rs.12000 !!!!

I booked two tickets on may 8th from Mumbai to manglore . The amount i paid for these tickets was Rs.12000. These flights were booked for the travel of one sick person. However due to jet airways cancellation we had to book another flight at short notice, which cost double.
I have called almost every week since then, i am still waiting for my refund. For us regular citizens, that amount is huge and i desperately need my money back. I have been driven exhausted calling all these numbers and received fake promises of a refund .
I cannot do this anymore.
PLEASE GIVE ME MY REFUND AMOUNT BACK!