Wow - this is super weird, Donald. When I saw the word "hijack" I assumed your were talking about this entity hijacking your GMB listing, but you've clarified that this isn't so. Bearing in mind that I haven't dealt with this scenario before, here is what I see.
When I search for the Galveston address in Google's main engine, I see:
https://www.google.com/search?q=1644+Lynn+Ogden+Lane+Galveston%2C+TX+77550&oq=1644+Lynn+Ogden+Lane+Galveston%2C+TX+77550&aqs=chrome..69i57.463j0j4&sourceid=chrome&ie=UTF-8
You are right ... there appear to be a number of listings that have been created for this business.
When I click into Maps, I see the following error message:
Maps can't find 1644 Lynn Ogden Lane Galveston, TX 77550
So it would appear that address doesn't exist. Let's check Smarty Streets just to be sure. Yep! As I suspected "address unknown".
So, the address being used doesn't actually exist.
Calling the phone number several time only yields a busy signal.
The website listed on that Wufoo form is your client's own website. Are you seeing a website anywhere for this other entity?
The Manta listing for the strange entity is bringing up a 404 error page: https://www.manta.com/c/mh1l5py/s-s-s-custom-closets, but I'm seeing a live listing on Hotfrog and a couple of other low level directories.
I have to ask, what would be the point of this spam? If they're pointing to your client's website, and the phone number on those weird listings isn't functional, how would this be a successful spam strategy? I just don't get it.
A couple of questions, Don:
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Are you positive your client has never attempted to operate any type of undertaking in Galveston? Positive they didn't try to do anything spammy on their end, like set up a fake location there? No offense intended in any way, but sometimes clients have done weird things in the past that we don't know about unless we ask.
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What is the email being listed on those weird listings: warblingjulian@rediffmail.com. Is that your client or the unknown entity? Have you investigated that email at all...tried to write to them? I just don't see any other way to contact this unknown person than by filling out the form/emailing them, if they have no website or working phone number.
One suggestion:
I would urge you to do some work on your client's website to locally optimize it better. The website is currently very vague about its location. The homepage, contact, footer, about, etc. should list the full NAP of the business. Right now, I'm seeing a mention of the city here and there, but to ensure that your client retains dominant status for its name + location, some optimization needs to be done on-page to associate that brand name with the correct street address.
Please, if you can, answer the couple of questions I've asked, and thanks for bringing this mysterious case to the community. It's just not adding up for me. It's not typical local spam.