I have LG G2 Mini running Android 4.4.2 with Kernel 3.4.0. If you need Build number or Software Version or Baseband version , let me know.
I tried to search but couldn't find anything useful for how to disable the reading voice on incoming calls?
The "reading voice" on incoming calls may be part of the Accessibility Features that are a part of Android. It also seems that LG has a setting for enabling Voice Notifications for calls and texts - try that too.
Ensure that the following settings are turned off/unchecked:
I can't speak for that exact phone, but it might be found in the settings of the phone application (not the general settings app of the device). I've seen it there before, try looking for something that mentions Caller ID.