I've been charged twice for 6 month premium membership

I bought a gift coupon (6 month premium membership) and applied the coupon on Sep. 7th. The account page said my membership would start on Sep. 9th. But I was charged again for a 6 month premium membership (8000 Japanese yen). It means I have been charged twice for a 6 month membership, a total of 15195 Japanese yen. Can you help refund my double payment, please? Thank you!

I took care of it for you and refunded Premium payment. You were on active Premium subscription but then you also applied the Gift coupon.