Thanks for the advise guys, ufortunately there is no such warranty in m area. To be a responsible company, and if they are confident with their technologies and products, DJI should provide certain extent warranty for certain period, such as 7 days no-question-asked guaranty (free repair or replacement), and 30 days conditional repairs (paid service). Usually, after 30 days, the user should have built enough experience and control over the drones.
Simply keep quiet and do nothing and put pressure people who bought their products, is a very bad attitude.
I have given up the whole thing already, I do not trust them, but I will continue my sharing of finding to them, and keep them alert to pay more attention to their products, and the user that trust them. Hoping that people like you guys, can have good experiences and good videos definitely.
By the way, I had playing the drones for several months, and having so many good memories, over the lake, the sea shore from kilometers away, so beautiful! I did some mod on my remote, to improve the stability, and control; I do not mod the drone as I know, it is sensitive.
It is a good technology and good tool, but they need to know, the user's feeling, when unexpected bad think happen.