i would reach out to local media or post on larger facebook pages for your county/town and try to put the shelter on blast

i would also reach back out to the police again and perhaps home again for legal advice because this sounds entirely against the protocol everyone was supposed to conduct. i'm sure you are not the first this has happened to, so it seems unrealistic that the final option is to just let it go because people think it's "too cruel" to revoke a cat that was improperly adopted out to return them to their rightful family.