Harassment and ******* billing

In 2005 I paid up my arrears on my FNB Gold card. I asked the clerk who accepted the last payment to cancel my card and in front of me to cut up the card with scissors - which she did.<br> In November/ December 2013 I receive a phone call from a collections attorney that I must pay the arrears on my FNB credit card or be handed over.<br> The more I try to communicate with FNB as well as the collections firm the more frequent I get harassed with phone calls and threats.<br> The card in question had not been used since 2000.