I'm Doug, and I'm sorry to hear of the confusion. My goal is to provide you with excellent service today.
Social security only considers your top 35 years of income in determining your benefits. So if any of the years since you have retired are in the top 35 years of your life, then social security will increase your benefit to account for the addition earnings. Absent one or more of those years being in the top 35, then you would not get an increase based on work that you do after retirement. The social security taxes that you pay are used for the nation---they are not put in a separate account for you. Some people get more retirement benefits than they ever paid for and some get less.
You may get a replacement Medicare card using your online “my Social Security” account. If you don’t already have an account, you can create one online. You can open your own social security online account and see your earnings statement, estimated retirement benefit, get a replacement Medicare card and much more, in about 15 minutes through this site:
Once you are logged in to your account, select the "Replacement Documents" tab. Then select “Mail my replacement Medicare Card.”
Your new replacement card will arrive in the mail in about 30 days at the address on file with Social Security.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours well in the New Year,