How can one advise an unjust official who is obstinate in his opinion, and how can one deal with and be patient with his actions?

The wise person should accept the advice of their brethren, thank them for it, and gently decline what they deem unsuitable. For every son of Adam is fallible, and Allah commanded His Prophet, peace and blessings be upon him, to consult his companions by saying: (And consult them in the matter). If you had been rude and harsh in heart, they would have dispersed from around you. And whoever is proud of his own opinion and disregards the opinions of his brethren should fear being continuously in error, for some people see their evil deeds as good. If you are wronged by an official, you have the right to demand your right from someone above him, or to be patient and seek reward from Allah, considering the harm from creation as a divine decree, and remembering the reward of the patient (Indeed, the patient will be given their reward without account).