This may be a special internet phone harassment, not necessarily a harassing phone call in Xinjiang.

If your mobile phone often receives harassing calls, you can install Tencent mobile phone housekeeper to intercept it, and you can also set a reply tone.

There is harassment interception on the main interface. After clicking enter, please click the button in the upper right corner of the screen to pop up the menu. Click Block Settings. You can see that in other settings there is an option to intercept the call reply tone. Click Enter to select Reply to Shutdown.