Amazon Customer Service does not have customers in mind

I am extremely disappointed with Amazon. I have an Amazon account but haven't used it for a while thus forgetting my password. I cannot reset my password because the email address I registered with is no longer active. I have emailed their customer support 4 times but to no avail. No contact whatsoever. My Kindle is linked to my account and I would like access to all my past purchases. You can change your email address once you are logged in but cannot change it beforehand.

I would appreciate someone contacting me and assisting me urgently.