Hi,
I am sorry for the delayed response. If you haven't located the transaction please reach out to our Customer Support through the contact section on your account.
As we are unable to see or discuss your account through the Community, you should try contacting us directly via Twitter @AskPayPal or via Facebook https://www.facebook.com/PayPalUK and we can look into this further for you.
The payment could have been a guest payment, which is where PayPal process a debit or credit card transaction without having to sign up for an account. These types of payments would not appear on your history.
Martin
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