1. Research your brand of garage door opener on how to reset garage door opener so all remote control won't work.
After reset, non of the remote should work. But the wired button in the garage should still open/close the door.
2. Gather all your remotes, such as remote for cars and outside remote keypad, and program garage door opener with your specific remote,
3. This way, the mystery remote that open/closed the garage door would no longer work.
