Through elections
Umm, no. Elected politicians can do whatever tf they want. There's no legal mechanism to make them fulfill the promises they made during their campaign.
That we elected
Not to mention that elected politicians aren't controlled by the people, most of the government positions aren't elected.
Through democracy
Democracy is when Government is owned by people. People own government through democracy. Great argument.
If I ask a friend to water my plants, do I no longer own the plants?
If you ask government to persecute people who break the law, do you no longer own people who break the law?