1. We are just users like yourself, you are not addressing Apple.
2. If you bought it directly from Boost, then you need to return it to Boost, and their return policy would apply which may be different to Apple's. If you bought them directly from Apple either online or at an Apple Store, then you need to return them to Apple as explained in page I linked to above, Boost will likely not take them in since you did not buy them from them.
3.You can order whatever you want now, and wait on the refund from Apple, if you paid with a credit card, it should be refunded to that. There's nothing stating you need to wait for the refund to order anything else.
For more information and more specifics I suggest you contact the Customer Service number.