Here is the manufacturer website:
http://www.aimtop.com.tw/
It distributes to evike.com which is a shitty retailer (And thats where your gun came from).
And yes, its also a very shitty gun and yes we know!!
No need to give us advice on shitty china brands.
This is a video about this shitty gun and it has the same logo on the body as your gun:
YouTube - Introducing AIMTOP M4A1 AEG plastica with Desert camo. along with 30M shooting test