I had the same thing happen to me. I tried running a script for a month without luck (Sydney region). What did work was adding a credit card to upgrade to a paid account - no issues launching an instance, and it's still covered under the free tier.
Not OP, but I do the same for ~7 accounts across 5 institutions. There's no need to contact them since you can manually download the statements, but it's a chore if you're doing it frequently. I usually run my script a few times a week.
Check out some of the RK3588-based SBCs. The Orange Pi 5 Plus is a fantastic alternative to the Raspberry Pi 5 if you're okay with a bit of fiddling as mainline kernel support is still a work in progress.