Infraction received as "Private"

I received an infraction today due to a post by me on 11th. Infraction was as follows:

How am I supposed to "learn from my mistakes" if I don't have a clue about which post of mine deserved an infraction?

Here's the deal from FAQ:
- Running up post count/post has no value - Posts such as "pm sent", "lol" or any other useless post that does not contribute to the forum or the thread is considered a post that has no value. Posting numerous "welcome to the forum" posts in the Introductions forum is also considered post padding or running up your post count. Posting an opinion in a sales thread such as "great price, good luck with the sale" but not actually bidding or participating is not allowed.

I have the right to demand for which post I got an infraction in a nice platform , since DP is not nice but literally the best , how come there's no reason shown for my penalty?

I'm asking this not for myself or trying to prove I haven't done anything , nothing comes without reason so some mods've seen my mistake and gave infraction.
My point is :

Let people see what their mistakes are and make forum cleaner if that's the case.
Just my 2 cents,
Regards.

 

"private" means the post/thread was deleted.