Serious Security Issue Needs To Be Resolved

My Amazon Prime account was hacked and since 8 August I have been unable to regain proper control of it. The person who hacked my account changed both the password and the phone number attached to the account, so I could not log in or secure it myself. Recently I finally received an email from Amazon asking me to log in and change my password, but because the hacker had already changed the credentials, this was not a workable solution for me. Despite this, I have been calling Amazon support every week since 8 August and explaining the situation in detail. Each time I am told that I am speaking with the right department, that the issue will be resolved, and that I will receive confirmation within 24–72 hours by email or phone. I have never received any of these promised confirmations, and the account situation is still not properly resolved. In June I was charged $139 for the renewal of my Amazon Prime membership. Given that my account was compromised and that I have not been able to use Prime safely, I do not find it acceptable that I have paid for a service while receiving no effective support to secure my account. After spending so much money with Amazon over the years, it is very disappointing that my security concerns and repeated calls have not led to a solution. I request that this hacked Prime account be completely cancelled and deleted, and that the $139 Prime renewal fee charged in June be fully refunded. I also ask that I be clearly informed, by email or phone, once the account has been cancelled and the refund has been processed, so that I can be sure this matter is finally resolved.