Cannot create email again after deleteing the user and email address

Cannot create email again after deleteing the user and email address

I created a user under my account arttantra in Zoho Mail and associated the wrong mail account w/ the user.  So, I deleted the user thinking it would free up the previously created mail account and then tried to create the mail account with correct user, but Zoho now tells me the email already exists.
the email id i created was shubha@arttantra.com and shuba@arttantra.com
how can i rectify this?
I've also mailed to support@zohomail.com  haven't got any updates from them yet :|