user8209: Last year, there was an incident where the arbiter ignored cheating, and I filed a report to register a case to FIDE Ethics Commission. The registration was made by email, in November 2017, and I have the confirmation mail that my request was received.
Although one year passed, no one has contacted me. The case was not even classified as "not admissible" in the website. 
I sent them another email asking for the status of my application, and again, no response.
What does this mean? Was my application form somehow invalid and therefore nullified? Should I register another case?
There are several cases where FIDE published a decision, both for national and international tournaments.
How should I proceed?

user20721: You should ignore FIDE.
Drop your membership.
Never play in their tournaments again.
Clearly they need  you more than you need them.
Quitting will show them who is boss. 
So be the modern day Fischer and refuse to deal with them till they see it your way. 

user825: Please don't waste your time anymore. The FIDE committee won't take a random case like yours. They don't have time.
The committee won’t do anything unless there is a powerful national federation supporting you or the media like chess.com put your case to public.

Ask for help from your national federation
Submit your story to chess.com or Chessbase

Honestly, you don't have a chance. You have no evidence cheating occurred. Forget about it, it was just a game. Ok?

user4418: 
How should I proceed?

You should get on with your life. 
It was a minor incident which you brought to the attention of the arbiter. You disagreed with his decision but did not lodge an appeal with the appeals committee and you did not escalate to the national federation. Instead you went straight to FIDE. They are clearly not wasting time on this and nor should you.

8209: <p>Last year, there was an incident where the <a href="https://chess.stackexchange.com/questions/19163/arbiter-ignored-cheating-and-i-signed-the-scoresheet-did-i-lose-my-right-to-ob">arbiter ignored cheating</a>, and I filed a report to register a case to <a href="http://ethics.fide.com/" rel="noreferrer">FIDE Ethics Commission</a>. The registration was made by email, in November 2017, and I have the confirmation mail that my request was received.</p>

<p>Although one year passed, no one has contacted me. The case was not even classified as "not admissible" in the website. </p>

<p>I sent them another email asking for the status of my application, and again, no response.</p>

<p>What does this mean? Was my application form somehow invalid and therefore nullified? Should I register another case?</p>

<p>There <a href="http://ethics.fide.com/images/stories/Ethics_case_1_2017_Final_Decision.pdf" rel="noreferrer">are</a> <a href="http://ethics.fide.com/images/stories/ETH_Ruling_St_Petersburg_alleged_cheating.pdf" rel="noreferrer">several</a> <a href="http://ethics.fide.com/images/stories/Ethics_case_7_2015_Decision.pdf" rel="noreferrer">cases</a> where FIDE published a decision, both for national and international tournaments.</p>

<p>How should I proceed?</p>
 20721: <p>You should ignore FIDE.<br>
Drop your membership.<br>
Never play in their tournaments again.</p>

<p>Clearly they need  you more than you need them.
Quitting will show them who is boss. 
So be the modern day Fischer and refuse to deal with them till they see it your way. </p>
 825: <p>Please don't waste your time anymore. The FIDE committee won't take a random case like yours. They don't have time.</p>

<p>The committee won’t do anything unless there is a powerful national federation supporting you or the media like chess.com put your case to public.</p>

<ul>
<li>Ask for help from your national federation</li>
<li>Submit your story to chess.com or Chessbase</li>
</ul>

<p>Honestly, you don't have a chance. You have no evidence cheating occurred. Forget about it, it was just a game. Ok?</p>
 4418: <blockquote>
  <p>How should I proceed?</p>
</blockquote>

<p>You should get on with your life. </p>

<p>It was a minor incident which you brought to the attention of the arbiter. You disagreed with his decision but did not lodge an appeal with the appeals committee and you did not escalate to the national federation. Instead you went straight to FIDE. They are clearly not wasting time on this and nor should you.</p>
