Amazon SMS OTP Verification Code Fails to Log In Account

For about one week I have been unable to access my Amazon.com account. Each time I try to log in, Amazon sends me a verification code by SMS, but when I enter the code the system will not accept it. This has happened many times with many different codes, and now my account appears to be blocked because I tried so often. I have contacted Amazon customer service several times about this issue. I was told that the problem would be resolved within 48 hours, but nothing has changed and I am still unable to log in to my account. I am asking for my account to be urgently unblocked and for the login and verification process on my account to be fixed so that I can access and use my Amazon account again.