Deleted @ntlworld account issue - still getting emails and spam forwarded to new @virgin email
I've just deleted my partner's old unused @ntlworld account (she hasn't used in years) as she is all of a sudden getting bombarded with spam being sent to that account and forwarded to her active @virginmedia email account.
This was done yesterday and confirmed as deleted yet she is still receiving forwarded Spam emails.
Why is this happening if the email account has been deleted (dead)?
It's driving her insane - any advice would be appreciated.