How to deal with malicious harassing messages?

You can call the police if you are harassed by text messages. If the perpetrator writes threatening letters or threatens the personal safety of others by other means, and repeatedly sends obscene, insulting, threatening or other information, which interferes with the normal life of others, he may be detained for not more than five days or fined not more than 500 yuan.

Legal objectivity:

Article 42 of the People's Republic of China (PRC) Public Security Administration Punishment Law shall be detained for less than five days or fined less than five hundred yuan for any of the following acts; If the circumstances are serious, he shall be detained for not less than five days but not more than ten days, and may also be fined not more than 500 yuan: (1) writing threatening letters or threatening the personal safety of others by other means; (2) publicly insulting others or fabricating facts to slander others; (3) fabricating facts, falsely accusing and framing others, and attempting to subject others to criminal investigation or public security administration punishment; (4) Threatening, insulting, beating or retaliating against witnesses and their close relatives; (5) sending obscene, insulting, intimidating or other information for many times to interfere with the normal life of others; (six) voyeurism, sneak shots, eavesdropping, spreading the privacy of others.