Purchased used Nissan sentra at time of purchase t...

Purchased used Nissan sentra at time of purchase they could only find one key. Promised to mail me a a credit voucher to come in and get second key. Never received said voucher. Less than 2 years after purchase the key that I had stopped working. When came into service dept they made me pay for 2 new keys/remote even tho I had purchased warranty. This was the 4th vehicle over the last 5 years i purchased from sansone will definitely be the last time i use this dealer.