Creditor keeps reporting me to collection agency for non-payment even after i filed bankruptcy. Is it allowed?

I had the bad luck of doing business with a very vicious, ruthless, and crooked creditor. He used every single tactic he could to get money out of me, but i kept resisting him. He placed over 67 calls a day using an automated voice. He then bombarded my email with demands to pay. he totally flooded my inbox with like 40,000 mails demanding payment. I told him i have bankruptcy lawyer and he responded using abuses, "no you don't, you bus turd" My bankruptcy lawyer contacted this creditor asking him to stop placing calls. Then this creditor sued me in court, KNOWING i have a bankruptcy lawyer. I physically had to go to court just to tell i have lawyer. His objective was to stress me out, by making me go to court because he knew it bankruptcy filing will discharge the debt. Then he again sued me in court of appeals, saying, "proof of bankruptcy still not shown". Second time my bankruptcy lawyer contacted court and his suit was thrown out. Then i filed chapter 7 bankruptcy. However, even after filing chapter 7 this vicious creditor keeps reporting to collection agency that i'm seriously delinquent. I checked my credit report and all other creditors whose debt was discharged no more contact the credit bureau. But this creditor alone keeps doing it out of pure vengeance.