Quote from: Guglevois on Today at 12:32:07 PM

I am going to do this, but maybe there is more institutions where can I report this scam?

Just report it to the local authority where the parent company operates. You can find their address based on their "about" page.

Quote from: https://www.papaya.eu/about

Papaya was founded in January 2012 and is a fully set up Electronic Money Institution (EMI), headquartered in Malta. Papaya is regulated by the Malta Financial Services Authority (MFSA), the single regulator for financial services in Malta – a growing international financial hub.

The MFSA is the authority that will take action against them. But I'm not sure you won't need a fee to process it, just reconsider that all you want to claim is 50EUR.
I prefer OSS opinion above, leave bad reviews wherever they promote.