yup, you are much better of sending a message to the shop support.
They can look at your order and see if there was a mistake at their end or yours.
Surly it is just a misunderstanding one way or the other.
Also it might be worth checking that your ordered the correct poi on your end in the mean time.
This product
http://www.homeofpoi.com/shop/productDetails/Pair-of-Foxy-sock-POI looks very similar but actually comes with the white tennis balls instead of the led balls.
Hope you sort out your problem soon.