Are they still denying they were the cause of it?They have updated the message when you try to update your card details.
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Update 24/1/2015
Updating Your Card Details
Please accept our apologies, we are currently changing our payment platform.
You should be able to add your new card details from Wednesday 28/1/2015.
The Changes
The new platform will look a little different. When you update your card details, you will be directed to our Payment Partner page to enter your card details and then back to our site afterwards.
You won’t have to do more than you would do ordinarily, it will just look a little different and is totally secure.
Waiting for a Game?
We are still receiving and despatching rentals during this period including new releases. You should also be able to manage the rest of your account as normal.
However, if you are currently waiting for a game, because your account needs new card details, please email us at customersupport@boomerangrentals.co.uk with email subject “Allocate Game” and will despatch a game to you as quickly as we can. This is only a temporary measure, just while we wait for the new payment platform to go live.
Thank you for your patience, we will let you know when you will be able to update your card details, as soon as we can."
That sounds like admittance to me.. why would they bother upgrading their security systems if according to them it was already secure and hadn't been compromised? Of course it's a good thing they're actually upgrading their security, they need to just admit it and get on with it, tapdancing around the problem just confuses your customers and is more likely to make them not come back than if you were to just be honest. At least if they admit it those who haven't been hit can take precautions.