Ace Cash Express Harassment, threats Internet

 This company has sent me many messages threatening and telling me they're from the United States courthouse and that I owe them a certain amount of money. Also, that I have a few days to pay it up or else I will have bad credit because they're working with all three bureaus and crimal record because they're also working with the FBI. If I dont answet within 48 hours then they will file court case at the United States courthouse aagainst me. And, also they will filee a warrant against me if I don't answer soon. I filed for bankruptcy and all of my debts have been cleared up so I don't understand why they keep harassing me and they keep threatening me and trying to scare me. Also, I'm not sure if I ever had an account with them, but either my bankruptcy cleared ALL my debts.