When user receives a warning, he can't do anything. Even ask the moderator why did he warn him.

If user doesn't agree with the warning, he should have an ability to dispute. At least have PM functionality.

Acknowledge means you read it, you can dispute after you acknowledge that you read it.

Hmm... may be here is an inaccurate translation into my language. If what you said is what IPS devs meant, it's my misunderstanding.

Yes, basically you must acknowledge that you received it, not agree with the ruling. It's like a read receipt that you have to click, that's all.

You could always choose the language the suits you.