<Cybersecurity Professional Mode>
For those getting confused about the situation, there are 2 unrelated issues here:
1. Criminals got hold of my CC details and used them. Difficult to determine how this has happened, as the details have been provided to many merchants, including pay aggregators like Google Pay and PayPal. This is exactly the reason I always prefer using PayPal if possible, to minimise places where these details get exposed. Specifically, regarding the payment for the UK ETA, I used the Android app provided by them. It's published on Google Play and has all signs of authenticity. And I was granted the ETA, as I entered the UK a few days after the payment (after Jan 8th, which is when it became effective) without any questions asked.
2. How these 3 transactions have been handled by HSBC. There are at least 3 red flags which should have prompted additional verifications, or even outright blocked the transactions on the spot:
a) There have been 3 successive transactions initiated overseas in foreign currency for amounts in excess of $4K. This in itself should be enough for additional layers of protection to be invoked, which I've experienced many times with HSBC (BEFORE this incident, not after, as
@BJReplay assumed), for much smaller amounts. This includes temporary passcodes sent to the mobile via SMS or email. None of these happened in this case. The only sign of something going wrong was an SMS telling me about the suspicious transaction (the >$8K one), but it was after it had been let through.
b) The 2 smaller transactions are for EXACTLY the same amount, and the bigger one is for the amount which is EXACTLY twice the amount of the smaller ones. This is also a clear red flag.
c) The last transaction exceeded my credit limit. Normally, such transactions should be (and have been from my past experience) outright declined. Yet, in this case it had still been allowed through.
All the above raise big question marks over the HSBC transaction acceptance criteria. I really want to discuss this with someone with high enough authority on their end and seek not only the resolution of these transactions, but also a compensation.
</Cybersecurity Professional Mode>