Freewallet mention that their company is officially named WALLET SERVICES LIMITED (HONG KONG)
Wallet Services Limited Suite A, 21/F, Eton building, 288 Des Voeux Central, Hong Kong

This address is listed on the site as the main contact for communication. However, on the building itself, as can be seen on the maps, there is not a single sign associated with Freewallet. In addition, Wallet Services Limited Hong Kong ceased to exist in 2022.

I also found some more companies with same names:

1. Wallet Services Limited, Edinburgh, UK: This company is headquartered at 3 Lady Lawson Street, Edinburgh, United Kingdom. It focuses on services related to financial technology and has a single office in this location​

2. Wallet Services Limited, Wrexham, UK: Previously registered under this name with a registered address at Flintstones, Springfield Lane, Marford, Wrexham. This company has been dissolved as of December 8, 2020​

3. Wallet Services Limited, St. Julians, Malta: Located at 5B, Office 2, Spinola Residence, Spinola Road, this company is registered in Malta and operates from a single address in St. Julians​

https://realreviews.info/legal-addresses/