Update: to clarify
1. it's not really a very general question that you can find from websites. It actually link to some issues of my application account. So quite specific, and not worries it's not some “I cannot apply because I'm in freezing period”
2. I do have the personal contact with HR as I attended the event. It's not the public mailbox that might have thousands of emails bombs.
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I have some general inquiries to HR. It’s not to shared HR mailbox but personal HR as they are the contact people for specific topics. However, they never reply. I feel quite disappointed that consulting is a people business but the recruiting team are not friendly at all. Btw I try multiple HR in multiple companies already.