To change my booking cost more than the actual flight.

When I 1st made my booking from Bali to Darwin I was told that to change my booking would cost $40.
So today after trying numerous phone numbers calling from Bali to Australia I finally found a number to get though on +61 3 9347 0091.
So after finally getting through I then proceeded to request a flight change to be told that it would cost me $170 to change a flight that cost me $160..
I tried to explain that I had booked through a travel agent but could not contact them and that I was told it would be $40, JetStar didn't care, they just said, well your only option is to pay $170..
So I said well thats not an option thats basically having no choice and was forced to pay that fee..

NOT HAPPY JAN !!!!

JETSTAR SUCKS BIG TIME !!!

International
Indonesia-Denpasar (Bali)
Australia-Darwin