my train of retractable landing for CX20

It arrived well packed, but once in place is not working!
I check several radio recovery tensions ok, ok output connection (auxiliary 1 and 2 ok)
it consists in attérisssage which is defective
I wondered HobbyKing returned an identical, this has brought other user satisfaction of my knowledge!
What is my application processed?
he told me that I contacted serat when the product is in stock!
Always presented as available on the website,,,, ???
thank you in advance for your positive feedback and good day to you
yet forgiveness for my broken English