HELP! 301 redirect causing neg SEO

While browsing ahrefs as I do every two weeks or so, I see in "referring domains" that there are multiple domain names pointing to my main site.
I own all the domains that are 301'ed except for one.

So this one domain name that is pointing to my main website (301'ed) I dont own.
I feel this domain name is causing negative SEO to my website. How can I get rid of that redirect?

Thanks in advance.

This might do the trick, if you can see the site that's doing it.

Thank you very much.

I will give that a go.

Corvox said:

This might do the trick, if you can see the site that's doing it.

Code:

<Limit GET PUT POST>
order allow,deny
allow from all
deny from .offendersite.net
</Limit>
RewriteEngine on
RewriteCond %{HTTP_REFERER} ^http://(www\.)?offendersite.net/.*$
RewriteCond %{REQUEST_URI} ^/.*$ 
RewriteRule ^.* - [F]

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