Just how does that scan not fall into the "utility bill for utilities consumed at your home address" category of accepted documents? The bill clearly stated my name, address and the date of issuance. Perhaps they are unable to translate Finnish? If that's the case, they should clearly state their language requirements too. The relevant words on the bill should be easy to pass through Google translate, though.
I got my account verified without having to submit any additional documents by just making a support ticket about it. Still no idea why it was denied at first.