After some more thinking (and a few more cold calls), we've figured it's a waste of our time too. Particularly when the cold caller is trying to sell visibility in an obscure register nobody has ever heard of. If you number among these, go look us up in the Finnish Business Information System, the information is valid, all requests for "updates" are pointless, all visibility for free will be accepted and nothing extra will be paid for.
Many thanks to Xetpoint Oy for the great template.