Hi @SimonDS, thank you for your post and for bringing this issue to our attention.
Having checked the bill, I can see that the discount has been applied and re-contract put through, although it does seem that human error has meant that the incorrect amount of discount was added.
I've also just process the refund back to your ongoing payment method and this should be with you within the next 3-5 working days.
As I can't post account specific information, I've also created a ticket on your account with more detail which can be accessed here.
Please don't hesitate to get back in touch should you need any further information, or assistance.
