Fraud Crime Hazard Prevention Act Article 17

Upon notification from the competent telecom authority or judicial police regarding users suspected of engaging in fraudulent activities, telecom businesses shall re-verify and register the users' information within a prescribed period.For users who fail to cooperate with the re-verification and registration by telecom businesses or inconsistency found upon verification, telecom businesses shall restrict or suspend the provision of such telecom services.
中文原文 詐欺犯罪危害防制條例第17條
電信事業經電信主管機關或司法警察機關通知用戶或使用電信人疑似使用電信服務從事詐欺犯罪,應限期重新辦理核對及登錄該用戶之資料。
用戶未依前項規定配合電信事業重新核對及登錄或經核對與本人不相符者,電信事業應限制或停止提供該項電信服務。

English translation for reference only; the Chinese text prevails. Not legal advice.