1. Contact Ailin Quanzhuang: You can contact the staff of Ailin Quanzhuang to explain the situation of refunding the price difference. If the refund period is clearly stipulated in the contract, you need to contact within the period.
2. Negotiation: If Ailin Zhengzhuang agrees to refund the difference, the specific refund amount and method can be negotiated. If the two sides can't reach an agreement, they can consider other ways to solve the dispute.