When you buy U, what does the seller ask you to provide? You should also specify in advance what you will provide when you sell. If you cannot provide it, there will be no transaction. Think about it: if you buy U anonymously, how can the seller require you to do anything? Once the money has been paid, if the seller finds out you are anonymous, will they refund you 100% in the same way? They can only refund 80% to 90%, right? They are taking on the risk of dirty money. The situation you are encountering now is the same; if you keep dragging it out with customer service and cannot get a refund in the same way due to being anonymous, you can only get back 90%. If the seller refuses, you just have to wait.