Find online customer service directly on the APP, tell the customer service about your situation and ask how to solve it. Follow the steps of customer service to solve this problem. You can also leave a message for manual customer service on the official WeChat account of WeChat Luckin Coffee. Just wait for a reply. If you are in a hurry to use it, you might as well change your mobile phone number and register first.
You can search online by yourself, and see if there are other users in the same situation according to your actual situation. If there is, you can directly solve it. With so much information on the Internet, there must be users like you.