On (date), I ordered (item) from your website. The items arrived on (date) unfortunately; they weren't the items I had ordered. There must be some kind of mix up with the orders.
Please ship my correct (item) as soon as possible. Also, so I can return the incorrect...
Dear (recipient's name),
On (date), I ordered (item) from your website. The items arrived on (date) unfortunately; they weren't the items I had ordered. There must be some kind of mix up with the orders.
Please ship my correct (item) as soon as possible. Also, so I can return the incorrect merchandise, please send me a shipping box, with postage included.
Thank you for your cooperation. If you have any questions, please give me a call.
Sincerely,
(your name)