So, I've got a very young Steam account and I want to buy a Steam Deck. I've already put some money into the wallet to establish a legit purchase history.

I set up Paypal on my credit card, set up the purchase, ensured addresses were all correct.

Paypal's 2FA indeed recognized the charge and I authorized it on their end.

Steam rejected the payment.

And I get this error:

An unexpected error has occurred. Your purchase has not been completed. Please wait a few minutes and try again. If you encounter this error repeatedly, please contact Steam Support.

I tried to contact support, but when I went for "help with payment" I ended up on dead-end pages with no ability to file a ticket.

What on earth do I do to fix this, or at least get through to a human on support?