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you could use plastic cement

but later it doesn’t moves…

can you describe the exact problem? The new “neck” pieces that bandai uses are double ball joints, so that the head will have more movement. If you’re unfamiliar with this set up, just think of it like any other ball joint. You just press it into the allotted space it’s supposed to sit in, and then push the head onto it. That’s basically it. If the issue you’re having is that it wont stay attached to the body, it could be a few things.
1. The polycap neck piece may be damaged in some way on the ball part. this could mean that there is some plastic that has been cut off of it for example.
2. The “cup” that the ball joint should sit in has been warped, worn down, or gouged out, meaning that the plastic is no longer providing a tight fit as a result of missing plastic, bad molding, or it has been used so much the area has been made wider(this would more then likely happen to the polycap piece as it is softer).
3. the plastic forming the “cup” is broken. This could mean the plastic is cracked(which would be visible), or it’s been distressed enough to the point that it can come apart at any time(signs of this can be seen as “whitening” of the plastic).

other then these three things, your only other problem, and the most unlikely one at that, is that the polycap piece for the “neck” doesn’t fit, and that you have the wrong one. But like i said this is the most unlikely problem, as if that piece didn’t fit, then you would have the wrong polycap runner in your kit, and your whole kit wouldn’t go to together right, or at all. These neck pieces are all universal as well, so any kit that uses that piece, has the same size cup in the body, and the head on every kit it’s in. If you could provide more information on what the problem is exactly, it would be easier to help you.