This has happened to me 1000 times. 1st check to see if they are above you in rank. 2nd if they are not then, I know it’s difficult, don’t worry about it – they will fade away – is they are well then see if you can contact them (which probably won’t do much – I see you’ve tried that – maybe try whois) then see if you can contact the host (which again won’t do much) then do the google thing as stated above.
But if they aren’t above you in search then it’s not really doing anything