You can add a new card number when you buy something, I've not found any way to do it otherwise ????
If you bought your refundable item using the card that's now expired, they can still refund to it and it will be credited to the new card number by the bank.
If you have a pink ID card you can activate your wallet as a foreigner. Otherwise, any refunds that go to the wallet can be withdrawn to your bank, when your refund is processed you will receive instructions on how to do it.