Hi Wei,Thank you for reaching out to us in regard to the invoice.I would like to advise that as this is not a secure platform, we won't be ablr to look into this for you unfortuantely.What I can advise though, is if you can please contact us on 131245, or on our live chat platform, we will be able to look into this further for you and see why the discount wasn't applied.I would like to mention, if you have signed up with us before the discount was offered, we won't be able to get the promotional ...