Before doing that you can try once again contacting Kraken support and their CEO Jesse Powell on Twitter and other social media accounts.
Lesson learned, don't keep any money and coins on centralized exchanges long term.
I've like 5 people with same problem and ready to open a lawsuit.
I contacted some lawyers and for now I didn't get any quote below 10k USD (and just for me, not for a class action), they are shameless...
I sent many messages on social pages (FB, IG, Twitter, Reddit, Trustpilot...) and didn't get any help, they just reply "We escalated the problem [...]", pure bullshit.
Jesse Powell ignores my messages, everywhere, he seems to be as bad as his company, how can he let things like this happen and stay silent? I've seen one of his reply to a similar problem 3 years ago, he was really harsh and publicly said Kraken might keep the funds for an unspecified period of time, assuming a long period of time or forever.
I also opened a new ticket on 15th December and didn't get any reply.
@bbc.reporter:
You didn't read carefully, the account was mine but was closed on October 2021, the amount was 4238 EUR and Kraken said it was NOT sent back to the bank.