I got communication banned for no reason. Please help and/or explain.

To check your suspension: https://enforcement.xbox.com/

If eligible for a case review: http://enforcement.xbox.com/Home/HowTo#sub-topic0-6

You can find enforcement actions on your account by checking here: http://enforcement.xbox.com

Log in with your Xbox/Microsoft account, and click the big orange hammer on the left. You can request a detailed explanation of your comm-ban if you are able to submit a case review.

I don't know for sure, but maybe the XBLPET deleted the violating message after they issued your comm-ban. Usual scenarios for comm-bans include profanity over the mic and/or text messages to other players.

For information about your ban, and to submit a case review if eligible, you would need to go to http://enforcement.xbox.com

Xbox Enforcement does not use the forums and the only way to get help is through the enforcement website.

You can find out more information about your ban here-
https://enforcement.xbox.com/en-US/enforcement/showenforcementhistory

If you feel that the ban was wrongly imposed, check out-https://enforcement.xbox.com/en-US/home/howto#sub-topic0-6 to find out more info about case reviews

This FAQ/enforcement myths might also be helpful- https://enforcement.xbox.com/en-US/home/howto#sub-topic0-5?

Hope this helps!

To see about submitting a case review, you would need to go to
http://enforcement.xbox.com

Your warning is the code of conduct you agreed to. It doesn't matter how a situation starts. If you respond in a way that violates that code, you can be punished.