A) How can I get the extra space for the users setup via the link?
What does the status show for that referral? Is it listed as Completed, or is it in some other state? You can see this on your Plan page.
B) How can I remove the obsoleted emails referral dated 2009 to allow more relevent invites?
You can't remove them, and it doesn't really matter as incomplete referrals don't have an impact on reaching the maximum available earned space (32 referrals/16GB, on a Basic account), and even if you could remove them, you still wouldn't be able to send more referrals.