I ended my virgin media account about two years ago. Expecting my blueyonder.co.uk email to stop working about 90 days after I set up a new Hotmail account. I left the blueyonder address still linked in my Microsoft mail whilst it was still active just in case I had missed a contact to update on the mail change over. However, the blueyonder one has never closed. It hasn't been an issue until last month when I started receiving a substantial amount of spam, sextortion and "there's a problem with your payment" emails. I have checked on haveibeenpwned and the blueyonder address is on there from a data breach. I've seen others on the threads having success in getting their orphaned mail accounts deleted but on contacting customers services they didn't seem familiar with the issue, advising me deletion was an automatic process following an account being closed and they were not able to manually delete it.
I appreciate I could just remove the blueyonder address from my mail but knowing its compromised I'd prefer for it to be erased completely.
You have come to the right place. A member of the Forum Team can get the process completed permanently. Just wait a few days and they will pick up on this thread. They will contact you by private message to get your personal details.