NAT firewall for IPv6?

Hello NANOG community. I was directed here by our network administrator
since she is on vacation. Luckily, I minored in Computer Science so I have
some familiarity.

Luckily!

router. Or, ideally, is there an easy way to turn off IPv6 completely? I
really don't see a need for it, any legitimate service should have an IPv4
address.

Obvious troll is obvious after we just spent a week on this ...