I wonder that nothing happens from quest with the V80

Contact Support Directly: Reach out to the manufacturer's customer support again. Make sure to detail the issue clearly and reference any previous communications to expedite the process.

Community Forums: Sometimes other users have found workarounds or solutions to similar problems. Participating in or checking forums dedicated to the V80 or similar products might offer some insights.

Social Media: Companies often respond more quickly to public complaints on platforms like Twitter or Facebook. You might try reaching out to them there.