My answer is right, and it keeps showing that it is wrong

Hi Nicolás Roa Viertel,

If you're positive you found a mistake, you should be able to report it from the exercise.

Here are the steps you'd take:

Step 1:

Head over to the exercise where you found the problem. Click "Report A Problem."

Step 2:

From there, select "The answer is wrong."

Step 3: 

Then, you can add a description and submit: