Klarna is permanently on my do not trust list, as what I experienced told me they can’t manage their system correctly. And for someone who can put a derogatory mark on your credit, I’m not risking it.
(Bear in mind when I got the first email, just to be safe, I paid off the remaining balance the Friday of that week.)
I figured they caught and corrected it, so no harm, no foul.
When I tried using them at the end of the month however, (I think for upgrading my comp) they rejected my finance request. I wasn’t sure, but I had my suspicions it was due to their fuck-up as I only used them once.