creditors continuously attacking your credit years after ban

Anyone know how to fight creditors that falsely and unethically report things in your credit file, even years after a bankruptcy, lowering your score even more than before bankruptcy was filed ? It went up to high 600's. I didn't do anything different, and now its low 300's. Creditors are reporting old debt as active, that was discharged and cancelled out in 2008. Is it just a useless system of give up if you're exploited, and why bother ?