Blizzard rarely responds here.
This forum is for reporting bugs on the Battle.Net Desktop App; it is a one-way conversation. You report the bug and then the QA Team will attempt to replicate the issue.
With regards to games made by Activision, such as CoD, Blizzard can provide help with installation / update when the issue lies with the Battle.Net App; see Having Problems with Call of Duty? Read this first! for details.
Was the computer “sleeping / hibernating” before you opened it ? or was it off ? Does Battle.Net start properly if you reboot the computer ?
I think you should move this topic to the Desktop App Tech Support forum so that Blizzard can have a look at it. To move the topic, scroll up to the very top of the topic and click the pencil at the right of the title… as if you wanted to edit it. Then change the category to “Desktop App Tech Support” and click the 
button to confirm the change. That will move the entire topic.