What I bought on Double Eleven Tmall was oversold by the seller. What should I do?

I am oversold, too. Ou Shili sent a text message saying that it is not within the scope of out-of-stock compensation and asked me to apply for a refund as soon as possible. No one answered online customer service, and this attitude is not sincere at all. And I placed an order at 00:06, and people will buy it after 3: 00. How can it be oversold and the inventory may be close to zero? I consulted Tmall customer service. Please wait until after 25th when Tmall's compensation policy comes out. Tmall points may have 30% compensation, so you should protect your rights and interests.