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Or the domain registrar (Godaddy). Although they are not likely to do much unless they were directly impacting you (like you owned wroxallmotors.com or something). Even then, it can be an expensive and drawn out bun fight.
Nah, registrars aren't really concerned whether you personally have been damaged, the registry-registrar agreements force a responsibility on them and for the most part it's taken seriously. Of course there are bad ones, but for the most part, it's not worth the drama of ignoring complaints as all it does is escalate and take more time.
Now, someone making a complaint with no info is a bit different as is someone complaining because they don't like the content on a website rather than it being illegal or problematic in some other legal sense.
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But if you are an organisation and someone registers a lookalike domain, there are processes to have that domain taken down and reregistered with you (if you so wish). These processes involve the registrar. You just need to make the case. Hence my "not likely to do much" and "expensive and drawn" out comment.
stevo_com
https://www.actionfraud.police.uk/
Or the domain registrar (Godaddy). Although they are not likely to do much unless they were directly impacting you (like you owned wroxallmotors.com or something). Even then, it can be an expensive and drawn out bun fight.