Interest on Your Cash Balance Query

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I bought some foreign currency on my Barclaycard in June and paid off the amount in July. I didn't realise this would incur an interest charge as it counted as taking money out on your card. The first month in July I got the charge refunded out of courtesy. I have just received my August statement and again have been charged interest on my cash balance, I rang up and they refunded it, but I am a little confused why I've been charged it again when I paid the full amount off and I haven't taken any money out this month to incur the charge again. I only took the credit card out to pay securely for some flights for a holiday next year.

[Jeffrey Shaw]

Perhaps you were charged not interest but commission?

Anyway, the Bank's website presumably notifies you of what charges there'll be. Does it and did you read it beforehand?