Product: Vehicle loan or lease

I reached out to Nissan Acceptance Company advising them that I am having trouble making my XXXX payment and wanted to know my options. Nissan offered a 1 month deferent that I had accepted. XXXX advised to send the signed letter back to them via fax ( XXXX ) or mail. ( Per the email I have until XX/XX/year> to send the letter. ) After sending the letter via fax twice ( XX/XX/year> & XX/XX/year> ) along with mailing the letter ( XX/XX/year> ) Nissan continues to call me everyday ( XXXX ) even after speaking with them which is a FDCPA violation. I also asked them several times to stop the calls to allow time for the account to update. I was advised that the calls will continue per the contract. They have called me while I'm at work and after work requesting payment after advising them of the deferment letter. I have outlined the dates and times below. 

XX/XX/year> : Spoke with Nissan Acceptance to advise that I wont be able to make my XXXX payment iao {$1100.00} and wanted to know what my options were. I was advised that my options were to either make the payment during the 10 day grace period or I can defer the XXXX payment. I agreed to the deferment and was advised that the paperwork would be sent to me via email. 

XX/XX/year> : Spoke with Nissan Acceptance and advised them that I didnt receive the paperwork. Representative resent the paperwork for me to sign and send back. Received paperwork, signed it, and sent it to them via fax to the number listed on the letter. Called Nissan on XX/XX/year> to confirm the fax. Was advised to allow time for the letter to upload and to reach back out to them on Monday, XX/XX/year>. 

XX/XX/year> : Called Nissan Acceptance to confirm the fax. Was advised that the fax was not received. Advised that I will resend the fax along with mailing out the letter. 

XX/XX/year> : Resent the fax to the number on the letter along with mailing out the letter to the address provided on the letter. 

XX/XX/year> : Nissan Acceptance called XXXX XXXX XX/XX/year> : Nissan Acceptance called XXXX XXXX XX/XX/year> : Nissan Acceptance called XXXX XXXX  XXXX XX/XX/year> : Called Nissan Acceptance at XXXX XXXX  and advised that the letter was already sent via fax. Rep advised will push callback to allow time for the letter to be uploaded. 

XX/XX/year> : Nissan Acceptance called at XXXX XXXX. Advised that I had already spoken with them and was advised that the calls will be pushed back to allow time for the letter to be uploaded. 

XX/XX/year> : Nissan Acceptance called XXXX XXXX  XXXX XX/XX/year> : Nissan Acceptance called XXXX XXXX  XXXX Spoke with Nissan Acceptance. XXXX answered and requested to speak with a sup. Spoke with sup and sup reached out to the department that handles the uploads of the letters via email and asked for me to follow back up on Monday XX/XX/year>. Sup advised that the calls will be pushed back until XX/XX/year>. 
XX/XX/year> : Nissan Acceptance called XXXX XXXX  XXXX Called back and advised rep that I have already spoken with someone today and asked for the calls to stop to allow for the paperwork to be uploaded into the account. Rep said no and that they will continue to call me per the contract.