After canceling my account with XXXX, I returned a rental modem using a tracking label they provided. After shipping it, I found out many months later I was being charged for it through a collections agency. I disputed the claim, but recently I discovered the debt has been transferred to a different debt collection agency. 

I have contacted the XXXX representatives many times over the phone, which has transferred me continually between departments. Everyone can verify I was a customer and rented a modem, but no one can give me any information about the shipping label they sent me. According to them I did n't return it, but can provide no proof I did not use their shipping label. They refuse to give me this information and insist on requesting information over the phone despite no department providing this and frequently being dropped between transfers. I recently sent out XXXX certified letters disputing the claim to their corporate office and a billing center, but have received no reply. Online chat support has only directed me to tech support number, who could provide this information. After calling the number, the technician said he did not have this information, but could forward me to customer support, which I 've already spoken with several times. 
