If your credit card company stopped some unauthorized charges on your credit card where your former boyfriend used it without your permission, you are not responsible for paying any of the charges be it to your credit card company or the vendor that processed your credit card without your permission.If the company that the charges were made to is pestering you, you need to write the company advising that your credit card was used improperly and that the contact that it is having with you could be considered an unfair and illegal debt collecion practice.Keep a copy of the letter for future need.Good luck.