Thought i'd share this incase anyone else gets charged after taking this offer.
I took advantage of the recent (or current?) £8.00 off and free postage offer at Vertbaudet - about 15 orders in all through a couple of email addresses. Anyway, as soon as you order you get a confirmation email which showed the total due including discounts - a matter of pence for most of the orders. Today, a week later, I finally got emails telling me that a couple of my orders were being dispatched. But along with that I had 1 saying that they had taken £12 off my card for 1 of the orders.
Anyway, not being inclined to pay, I phoned them - using this freephone number (thanks to say no to 0870) 0500 012345. After being passed to customer services, querying the charge and telling them that I had email confirmation showing the amount due to be something like 40p, she apologized unreservedly and refunded the money to my card.