Was the domain deleted or the account deleted?
If you only removed the domain from the account, then your files are completely safe. Removing a domain doesn’t remove the files from the folder on your account where the website was linked to.
However, if that was your account’s initial domain it might have been assigned to the main htdocs folder. If you added the domain back, the domain will have been assigned to the betacoin.wuaze.com/htdocs folder. If so, you’ll need to move your files to restore your website.
If you deleted the account, then none of this applies though. Deleting an account permanently deletes everything on the account, including all files.