I too was foolish and clicked on the 'cancel transaction' link. I didn't have to enter my bank details or anything. A day later, my debit card got hacked. TWICE. Well, twice succesffuly. THey tried to take out over $170 in one transaction, and my bank wised up. THey placed a hold on my debit card, alerted me to possible fraud, and when I confirmed that the transactions had been fraudulet, they stopped my debit card, issued a new one, and now I'm in the process of getting my money back,. God bless you, Westpac!