XXXX believes I owe them {$220.00} dollars. However, XXXX can not prove that I in fact owe that money. Now, XXXX has hired XXXX debt collectors who have been calling me at work despite me specifically asking them not to call me at work. 

What happened was the following:1 ) I shipped books to an individual on XXXX in exchange for {$220.00} dollars. I have proof of that shipment via USPS. 

2 ) The individual claims to have received the books and then sent the books back to my home address. 

3 ) I never received the books allegedly shipped back to my address. The " purchaser '' of the books can not prove he actually sent them back to my address. 

4 ) Now, XXXX ( owned by XXXX ) wants me to pay {$220.00}, which I assume XXXX paid the original " recipient '' of the books. 

5 ) Recently, XXXX has engaged XXXX, XXXX-party debt collectors who have been calling me at work. 

6 ) I have told these debt collectors to stop calling me at work and call my cell phone, but they keep calling me at work which is unacceptable. 

7 ) I do not owe XXXX anything yet they will not leave me alone.