No, I’m not a Blizzard employee; I’m a player. A post by a Blizzard rep is in blue… as in this post.
No, I cannot. Generally speaking, account issues can only be resolved by Blizzard… if you can’t figure it out yourself.
If you can’t log into your account at all, you will need to submit a ticket to ask Blizzard to look into it. Start here: https://eu.support.blizzard.com/en/help/product/services/316/974
If the issue is only with the Mobile Battle.Net App, you might want to report the issue in the Battle.Net Mobile Bug Report forum: