Is it permissible to seek the help of an oppressor against another oppressor? May Allah reward you with goodness.

It is permissible for the oppressed to strive to remove injustice through legitimate means, but patience and forgiveness are better. He should seek Allah's help first, then seek assistance from dignitaries or judges. He must search for a judge who rules by Allah's law. If he does not find one and is compelled to resort to others to remove the injustice, it is permitted for him, provided that he does not take what is not rightfully his.