Ask HN: How to get domain with invalid contact details

There's a domain that I want. The registrant details were hidden behind Domain Discreet, which no longer exists, and none of the contact info works, email bounces etc. so I can't approach the owner and ask what they want for it. It was due to expire last year so I used a deleting domains provider to try and grab it, but several months after it was supposed to have expired it was re-registered by its current owner for another two years. Tried filing a complaint with ICANN about the invalid contact details but no dice. Advice?