How do you get your money back?

I ordered an Xbox Series X from Techinn on December 10th, 2020 with Klarna Sofortüberweisung. Now the readiness for dispatch has been postponed three times by a month.

This will probably repeat itself again and again, now you can order against everything, my mind sounds the alarm. Please help me how to get my money back. Why does such a thing exist?!

Why does such a thing exist?!

Auweia, a rather dubious Spanish site, why do you buy there?!

I don't know if and how you can get your money back through Klarna, but that should be the only option.