Earlier quoted context omitted.
Non-elected representatives from my country keep pushing for chat control via the council. How do I, as a citizen, hold them accountable?
Vote against the ruling party in your smaller national election
Even if there was an option in the national elections that didn't want this stuff, convincing a majority of voters to disregard national politics for an election cycle to have an imperceptibly small impact on the council members is such an unlikely outcome the council or comission would de facto be committing genocides before voters would be mobilized, and even then it's unlikely they'd face any repercussions.