Problem with log in to BN with specific number

For several days now I have had problems logging in to Battle.net.
I will describe what happened before the problem occurred.
A few days ago. I logged in to Battle.net.
I saw there was a new update. I clicked to start her process. Then after a second, Battle.net logged out and refused to log in again.
I entered my password and it turns out that I can’t log in at all.?!? In such a situation, you may feel cheated. However, it turns out that I noticed the following error with a specific number: BLZBNTBGS80000011.

Question: How to solve this problem?

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