The Bible has fantastic advice about conflict resolution. First, directly approach someone who has wrongfully harmed you and try to seek restoration. If that doesn't work, ask a third person, ideally a more mature fellow Jesus-follower, to act as a mediator and witness to your second shot at resolution. If neither of these options brings confession and forgiveness, the church is to treat the wrong doer as a "pagan or tax collector" (Matthew 18:17).