Conyac で依頼された翻訳結果を公開

Hello
We are contacting you from Japan.
We have taken a liking to your shop.
We had a great experience purchasing from you three years ago.
I am just checking my account. My purchase amount from March 2013 is around 5000 euros (please confirm).
But for some reason I am unable to use a gift voucher.
Why can it not be used?
If it is unusable, I find that rather strange.
I plan to make another purchase on the 17th of July, so please tell me the promotion code for the gift voucher.
I want to continue to purchase more from your store.
I await your reply.
Best regards,