I understand that you are frustrated by the QoBuz login issues and that QoBuz has been non responsive. PLEASE DO NOT GIVE UP. As I posted above, I emailed QoBuz with a copy of your post and my comments.
I suggest you log a support ticket in the Qobuz web app:
• Click the icon at the bottom right of the Qobuz web page.
• This opens options to access their contact form, help articles, chat with an agent, or leave a message if chat is unavailable.
• Fill out the contact form or leave your message to submit your ticket.
Are you able to stream and play music from QoBuz? Assuming yes, it means your account is still available and working. If not, please mention this in your ticket since it complicates the situation.
In addition to logging the above support ticket, I suggest you send them another follow up email, mention your previous emails, to see if it gets their attention. PLEASE DO NOT GIVE UP. LMK.