I have the same issue. All transactions are declined, no matter if offline or online(tried in Aldi today), since I updated to premium. If I use my new (activated) premium card, I get the following notification.
“It looks like you’ve reached your card limit. Please contact support”
I’m pretty sure I’m not even close to my limits.
If I use my old non-premium card, I get no notification. No matter which underlying card do I use, I tried cards from different banks, both credit and debit.
status.curve.com shows no issues, but it’s obviously a lie, people are complaining here and on many Hungarian forums too.
I wrote Curve support 2 days ago, got no response. This is really not a premium service, I consider downgrading.