Hello Taiyan
Sorry to hear of the email password issues experienced, we appreciate you raising this via the forums and welcome to he community.
As mentioned previously, if you no longer have active Virgin Media services we wouldn't be able to change the password for you, to reset the password you can try the following:
• Sign in to My Virgin Media
• Go to Account settings, then Account details
• Tap Manage next to Manage your Virgin Media Mail app password under Virgin Media Mail
• Then, under Virgin Media Mail app password tap Get password
• Continue the flow and a new secure password will be generated, and the mailbox unlocked
• Update any third-party apps that may be use to access your Virgin Media Mail emails with this new app password.