Sometimes people occasionally or intentionally create multiple Linguix accounts. Once they upgrade one of them, it may be difficult to understand, what account is actually Premium one. Follow these steps to find out, :
Login to your Linguix account with all your know emails.
If you forgot your password, reset it.
You will see a green Premium plan button for the account that was charged.
Alternatively, log in to your email accounts you use, and search there for the word “Linguix” to find any emails, including Premium plan purchase confirmations.