You can charge (Top up) your Suica with your credit card on Wallet (unavailable from 2:00 to 4:00 am) up to a maximum SF (Stored Fare) of 20,000JPY.
Select Suica in Wallet, tap the blue button→Add Money→Select the amount→Add→Touch ID or Face ID to complete the procedure.
For further support; Call Apple Care: 0120-277-535