Debt collection — Portfolio Recovery Associates, LLC (CA)

Debt is not mine. Couple of month ago I checked my personal credit report and I found out that Portfolio Recovery Associates , LLC aka, " Portfolio '' has reported collection to my credit report. Account # XXXX. This is the first time I found out about collection existence. Immediately - on XXXX XXXX, 2015 I wrote a letter which was sent via US Certified Mail # XXXX XXXX XXXX XXXX XXXX ( you can see the proof of delivery on USPS website ) with Proof Of Service by Mail. I requested : 1. Validation of Debt with all proof copies and 2. I informed Portfolio about how they reported collection to the credit report if they never inform me in writing, but if they did then I requested the copies of these letters. ( Representative from FTC informs me that all collection companies must to inform clie