I've been refunded but where did the refund go? It's not in my bank account.

Approved refunds take up to 30 days for bank cards. Click here for more information.

If the one used is no longer valid or it's already been that long, ask your bank or the iTunes Store staff.

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I have an refund request for order no MTYZFXYLNY and its have approved for return but last 3days its havnt credited my apple ID

whereas i have paid its from my itune credit

why not its credited ???