No, there is no way to do any of that.
Fundamentally if a user wants a refund or has a problem with payment, they need to contact Apple. There's no way that you can help them (and personally I prefer it that way, though I appreciate that others may have different opinions).
If someone emails me with a refund request, I typical ask them to compare with purchasing a book from an online retailer and then contacting the author to ask for a refund.
Topic:
App & System Services
SubTopic:
StoreKit
Tags: