Mastercard, Starling.
I challenged them, obviously. Their response was along the lines of 'we can't tell you because it's supersecretsquirrel stuff and you can't know'
Am both on gamstop and have the block on my card.
As far as the bank are concerned, these are schrodinger transactions.
If you challenge the card block then it's not a gambling transaction as its not coded 7995.
If you ask to chargeback it's suddenly a gambling transaction and no hope of a chargeback cos MC says so.
Somewhat akin to repeatedly slamming ones own penis in a bank vault door, only less productive.
Automatic translation: