[Kludge]

UPDATE...... with some help of another forum I now have the wifi login again, looks like they had a replacement router sent out, the guy used hashcat with ( I think) the same mask attack as the previous login, sadly it's just the wifi I can use with no access to the router itself.

Good to hear. If you're still trying to shutdown his music, you could use a lagswitch tool. It sends a very large amount of packets to the router, working like a DoS attack.

I agree with my hackless cut his power or make his power bill go up an insane amount idea best of all, but this is good too. Just DoS his router.
Let one of your machine's sit on any time he's on and just ping the router like a blonde teenager in a BBC porno.