Later, I inquired and came to know that Vonage has launched chat support for the technical and billing issues. It is really a milestone. They already have email support in which I will receive a response within 2 to 3 hours. To my surprise, the issue will be handled promptly and resolved without any hectic issues.
The direct link to chat is: https://support.vonage.com/app/chat/chat_launch_lb/
Hours of operation: Monday - Sunday: 09:00 AM - 10:30 PM EST