Thanks to everyone, will try those links.
With regards to the lawsuit – that's already in process, however we need all withdrawals to be blocked for now in order to not lose the money. But the support is inappropriately slow in that case.

For anyone concerned, I've also found a link that may help you in the future to escalate the ticket and probably get a reply:
www.kraken.com/escalate-your-ticket

Hello everyone, I will be glad to receive any info on the matter and appreciate you all.

Is there any ways to reach kraken except customer support desk? Their support was nice and quick, but now I get no replies from them for almost a week.

I had a severe issue that the access to the corporate account was stolen by the trusted person. Kraken freezed the account for a while, but now they claim that the issue is resolved and now I get no replies from them. Without any additional details – please tell what are my steps to recover access if anyone has encountered similar problem?

Our company has already provided docs for investigation, but I need the funds to stay in the account as much as possible before the solution is found.

If Kraken specialists are monitoring bitcointalk, then the issue number is #2554106.