Stuck on "Updating the battle net update agent"

I am trying to re-install the battlenet application for over 3 days now without success. I get either Error BLZBNTAG00000BB8 or the the process is stuck forever on ‘‘updating battlenet update agent’’
I have tried all the suggested steps from Blizzard and other users as for example at the relevant threads at Support forums Error BLZBNTAG00000BB8 - #96 by BlackWolf-12504 or in this topic here
Trying to submit a ticket to Blizzard with my DXDiag and MSINFO is impossible, all i get is ‘‘You can’t submit this ticket.
An error has occurred. This may be a temporary error, so please try again later.’’
Very upsetting that i can not access the games that i have paid for