在这个网站买了 6罐奶粉，但是他们 提示：
Hi, We are out of stock of the Nutricia Aptamil Profutura Toddler 3 900G and unfortunately we are unable to get more in from our supplier at this stage as they are out of stock with no estimated date of return as yet. How would you like to proceed with your order? Look forward to hearing from you. Thanks
我必须得回信给他们吗？会不会过几天有货后，他们再发货？
如我回信给他们，选择退货，那么这些钱是退给PP，还是退给关联的信用卡？
谢谢！
