Does the Fair Debt Collection Practices Act apply to major credit card banks?
No, it applies only to the collection attorneys and professional debt collection companies they might hire. Original creditors are regulated by state law; however, the major credit card companies follow policies that closely mirror those of the FDCPA and will comply with your request to stop phoning you at home and work, etc., just as if you were dealing with a collection service. If you believe you have been harassed by an original creditor, or that the original creditor has done something illegal or threatening towards you, then research your state laws on the subject and contact the proper authorities to file a formal complaint. Typically, the Attorney General in your state is the proper authority to contact.