This is a situation that is frequently caused by being logged into the incorrect account, which occasionally happens! For example, many people use multiple emails in their day to day and may accidentally purchase an account using a different email then they intended.
To help fix this, first double check that you are logged into the account you purchased premium under. Ypi can try checking your various inboxes for a receipt email from us -- we'll only send it to the email associated with the account you purchased premium on! If you aren't able to locate premium after doing this, please contact us and we can assist you further!