We recently discovered that a large, publicly traded corporation purchased a domain that they have pointing to our domain. Both the corporation and the domain are completely unrelated to our type of website. Their domain is now coming up above us in search engines for our main keyword. Their listing in Google looks like our listing (our title, description, etc.) and initially what was happening is that someone would click on that link and surf our site, even though it was their domain in the browser window.
We are now using a 301 redirect. Is that okay or will that hurt us in some way?
We trying to figure out if that is the appropriate action to take, especially since we are unsure what they are attempting to accomplish. Are they trying to steal our seo somehow, or are they maybe trying to damage our seo reputation, or are they trying to steal login information?
In attempting to research what is going on and what to do about it, I came across the same question basically where using a 403 was suggested, but the question about security or motivation of the other party was never answered. Why use a 403 as opposed to a 301? What is going on here?