Can I get a refund for the international SMS fee cheated by the website?

I can't. According to the charging standard of China Unicom's international operators, the behavior of sending or being defrauded of international SMS charges by mistake belongs to improper operation, which leads to an extra deduction that cannot be returned. International short message service refers to the service of sending and receiving short messages between the mobile phone customers of China Mobile, China Unicom and China Telecom and the customers of operators in countries or regions outside Chinese mainland.