The original debt of {$520.00} has been paid to the original creditor, XXXX, about a 1 1/2 years ago. CDI Affiliated Services insist I owe them a sum of {$260.00} of pure interest. There is no more principal because XXXX accepted my payment in full in order for me to receive services from them again. As far as I can tell CDI A.S. is in a violation of The Fair Debt Collections Act 808 15 USC 1692f Section ( 1 ) The collection of any amount ( including any interest, fee, charge, or expense incidental to the principal obligation ) unless such amount is expressly authorized by the agreement creating the debt or permitted by law. 
I can assure you no such agreement was ever established or authorized while creating the debt. CDI is not attempting to collect a single penny as principal, but rather {$260.00} of pure interest. Are they, or are they not in violation of this Fair Debt Collection Practices Act? They still currently show as owing XXXX {$260.00} on my credit report.