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That exclamation mark is the new design for the call app. If you tap on it, you can see further details about that call.
What firmware do you have? USSD codes should be fixed by now.
I wanted the build number but I found yours by searching the kernel on google. So you have .200? The problem should be fixed in .232.
You should receive the update but I have no idea when. Updates are released gradually and for different markers on different times.