Jetstar web site is a fraud

I tried to book a ticket through jetstar web site with my credit card on 13 Dec 2014.
At the end of my booking, i was prompted by the system that it decline my credit card details and void the booking.
So i redo the booking again with another credit card (issue by another bank). and again at the end of my booking, i got rejected with the reasoning.
I give up after that.
I got a shock when i recevied my credit card statements. Jetstar charges both of my rejected bookings.
I give my honest account of what happened to my bookings and stated in my email that I got no reason to double booked an air ticket on the same day, same time with 2 difference credit cards (Jetstar Case CAS-1190639-Z53NNY).
I got a reply after about 10-15 days that Jetstar need my to provide my credit card statements and email to them. The best part, jetstar give me a faulty or empty email address as listed:
"As discussed, for us to investigate further, please submit a copy of your credit card statement to customer.reponse@jetstar.com"
I forwarded my credit card statement to the mentioned address. Can you imagine the dis-believe and shock I had when i discoved that not only their booking system is a fraud, they can even give me a deceiving email address.
I totally feel hopeless at this point of time but i diligently find the correct email address and forwarded the statement to Jetstar.
And again after almost half a month time, jetstar reply my email asking for other doccuments to "investigate further". I comply again and email jetstar the require doccuments.
Today (after another half month), i got a call from jetstar that i need to furnish additional doccuments to "further investigate my claim".
I believed it will lead to no end.

Jetstar has a duty and responsible to first check their system as if there is no system fault at their side. If not the web site is there to CHEAT innocent air traveller. Don't travel Jetstar. Not worth the pain and anger.