Welcome to the community. I am assuming "old" means former and you are no longer a broadband customer.
If so, you have come to the right place. The Forum Team (VM employees) have a good track record of getting these situations escalated to the IT department for permanent deletion. Someone will contact you in this thread and then by private message to pass security and take your personal details. It may be a few days, depending on how busy it is.
After that, you can confirm the work is done by using the facility at mailtester.com - if in doubt, come straight back here!