After the attempts, I bought a bluetooth headset, but to my surprise his microphone didn't work either. my audio card is Realtek ALC269VC, my notebook is motion C.
That, you understood correctly, my microphone is 3.5mm.
Follow the steps in the previous article, but I still can't solve it. Looking at the conversation they had I came to the link PulseAudio/Troubleshooting - ArchWiki
Can you open terminal (Ctrl+Alt+T) then type alsamixer
In alsamixer, hit [F6] and check correct sound card is indicated.
Then hit [F5] to show all sound channels.
Post a screenshot of that display. It may give a us clue.