Security issues in the online booking system

I attempted to book a flight yesterday, (Christmas Day) travelling that evening to Bangkok, to see my daughter. Having reached the last stage, entering the security pin sent via sms by my bank, I did not receive it, so obviously could not enter it. I tried three more times with the same results. No pin from my bank, so no pin entered. I gave up at this point because it would have been too late to make the flight. I assumed no flight had been booked, without the security pin having been entered; Silly Me.

jetstar have debited my credit card account for the cost of the flight. I realise me not receiving the security pin is not jetstars fault, (that's an issue between me and the bank); what is clearly their fault, is booking the flight without that pin being entered.

On speaking to the customer service department, (which I believe is based in Melbourne), I was told by a bolshy female rep that I must have entered the security pin, for the transaction to go through. I did not enter it and can prove I did not.

I then spoke to an equally bolshy supervisor by the name of anna, who just spouted the same drivel to me, namely, I must have entered that pin; so I am lying?

Very dissapointed with jetstar, they treated a very serious security problem as if it was not a problem. My bank told me this is a common problem with this mob. Beware.