Consumer received a 'dunning ' letter from Signature Performance Tiburon LLC , XXXX XXXX XXXX, XXXX NE XXXX dated XXXX XXXX 2015. XXXX responded to the letter by sending back a dispute letter 'certified ' return receipt ( # : XXXX XXXX XXXX XXXX XXXX ) on XXXX XXXX, 2015. SIGNATURE PERFORMANCE TIBURON LLC, is denying consumer due process of 'written ' notification within the XXXX ( XXXX ) day timeline allotted consumer under the Fair Debt Collection Practices Act ( " FDCPA '' ) by not picking up the letter from the post office in a timely manner. Consumer has tracked the letter which is still waiting to be picked up from a XXXX Post Office. Consumer has added all 'written ' and tracking verification to this complaint to prove consumer 's position in this matter. By not accepting consumer 's dispute letter, consumer is being denied 'due process ' under federal and state law regarding debt collection practices and the FDCPA, FCRA and FTC XXXX Consumer is making this complaint to your agency as a form of administrative process that will verify consumer 's position in this matter should it be necessary for consumer to pursue a civil lawsuit. Consumer will have proof of consumer 's concern as reported to the Consumer Financial Protection Bureau ( CFPB ). Thank you for providing this venue as documentation. It is greatly appreciated.!