1. Tricky one. If the concerned player is hiding / camping in a banned spot, I would immediately slay him.
If the concerned player is hiding, then there's not much that can be done. I can either ignore it, or slay and pass the round if the round was over (LR given, etc; since after the LR is given, all reds may be killed.).
2. Players with high-pitched voices are allowed to speak freely on the mic as long as it's not micspam (noises, music..). In this case, I would silence the vote caster for Vote Abuse, based on the previous offences. /silence "#steamid" 1440 "Vote Abuse", assuming it's his first offence.