Wanjia prepaid card needs to be refunded.

1. Customers who need to return their cards first should go to the service desk with the prepaid card of CR Vanguard Hotel and explain to the service desk staff that they want to return their cards.

2. Then the chief service staff will use the intercom to call the housekeeping staff to check the things in the customer's room.

3. Finally, check the deposit amount with the customer face to face, and after going through the deposit refund formalities, you can return the card at no cost. Production cost refers to the cost of materials used to manufacture goods, which is generally used for documents.