Hard to say. My DB has a hand made product business which people are ripping off down to identical labelling, branding and marketing. I'm now prepping cease and desist letters for him with the assistance of a solicitors firm.
Sometimes you have to get mad, check out the law and go from there.....
For this though Zoos I'd be inclined to put up one post along the lines of
"We are so grateful for all the support for our small business since 2020, it's been a delight to provide you with beautiful clothing for your children and see all the lovely photos you share with us!
Sadly we are seeing a harrassment campaign by another small business and their friends, who clearly source their products from the same supply chain as us. We are not and have never been in competition with this other business, who we wish well however the ongoing harrassment is being recorded by us and all details will be passed to the police as a bundle.
We're very proud of our business and look forward to meeting all of our lovely customers at X event (or continuing to serve our community of lovely customers) and hope that you'll always find us well priced / well stocked / full of beautiful clothing for your families / similar positive ending to the post!
Much love, @Bubnbutton and staff"
And leave it there.