Blizzard has very low sense of customer satisfaction

[Kamigawa-twisting-nether]

Please read below topic and understand what Blizzard did.
Just saying sorry will close this case?
It will be not customer satisfaction. This is their responsibility. You really couldn’t understand what customer satisfaction means.

[BfA] After a recent update cannot log in, BLZ51901016

After a recent update, smthg about 100+mb, cannot log into the game. Getting BLZ51901016 every time. Before that update everything was regular. Have tried Interface/Cache/WTF manipulation, updated all the possible system drivers, checked the game client for any data corruptions, checked the internet connection, reconnected couple times, used vpn … nothing.