How to properly file for the re-opening of an I-290b?

Question Details: I had been waiting for my interview to be scheduled but I never received my notice in the mail and I've checked online and it hadn't been updated. After reaching out to the office where my interview was to be held, I was told my interview had already been scheduled and I had missed it. I didn't receive the notice in the mail nor did I get an email. I've been having problems receiving mail which is why I've always checked to see whether or not I had a notice in the mail. Is there any way you can please help me because I have been very careful not to miss anything? I have all of my documents and all I had was the interview. Now my case was denied and I was told to file to re-open but I'm afraid they might still deny it.

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