How to inform the editor that they sent me the wrong PDF attachment?
You may have to email an administrative contact in or outside the system. Keep trying. DO NOT include a revised version of your paper since that seems to have confused them. Let them know that you received a revision request for a different paper entitled "Whatever the other paper is called" by X and Y and Z, and that you'd like to see if you can get the required revisions request for your paper entitled "Whatever your paper is called" by A and B and C so that you can make the corrections. Even if you already have done them, try not to be confusing by resending the corrections to your paper.

I had an editor send me a PDF of required revisions once with the file named X.pdf. When I contacted him, he was very embarrassed because he had broken the blinding by admitting that X had submitted a paper that was under revision at the journal. Keep trying. Eventually they'll understand.