Hello silentg1971. I am writing this for you and any future visitor to this forum with a similar question.
I'm not sure if you have VM broadband service. If you cancel, be aware that any email addresses and mailboxes linked to your broadband service would be scheduled for deletion 90 days after service ceases, according to VM's own Terms and Conditions.
But the process fails all too often and leaves the former customer vulnerable to hacking and theft of personal and financial details years or decades later. Therefore, once you have settled with a new email address*, I recommend that you delete everything from all the folders to reduce the information available to hackers. You can use an email client for this (Try Thunderbird - using IMAP process which synchronises with the mailbox stored on the VM server).
You can verify the email address is deleted by checking the email address(es) through mailtester.com.
If still valid, you can come back to this forum and request that VM staff raise a ticket to get the mailbox deleted manually. The friendly Forum Team will visit the thread and then take your personal details by private message.
Best wishes to you.
* Forum users regularly recommend NOT relying on email addresses provided by any ISP. You are best to choose one that is portable, provides support, top-class security and decent spam filtering.