No screen, not for 3GS.

When I saw the offer of a more haléchante glass screen for my 3GS to j'me price'm saying "hey it's very cheap has to be a trick, but I try to go right" and I will do better to abstain.
Product delivered quickly, well packaged, I say nothing. But when I opened the box how to say; firstly, there is no screen mounted on the chassis, or so it is invisible ... And secondly, it's not a window to a 3GS but rather for a 4 or 4S.
In short, I made a complaint to the seller, I wait to see.
I wanted to prevent comments by the inconvenience, so be careful not to 3GS and there is no screen.