How to complain about arbitrary charges by mobile companies

I met the same situation as your scene a few months ago, also in the middle of the night. So I reported it through the SMS channel of 10086 (Jiangsu sent JB* to 10086), and then 10086 called me to ask about my situation. I told the truth, and she said to help me apply for a refund. I really returned it later. You can call customer service first. To be honest, it should be solved.