@DJac
I don't know what you ordered and what you received so I can't have any opinion on that.
Well, I'll post again the possibilities I see:
1) the hardware you got is defective
2) the hardware you got is functional, but there may be several submodels of the phone and the new camera is not 100% compatible with the previous one.
3) something else was damaged when the phone did fall.
4) there are problems with the repair.
Whatever the reason, if you asked for the exact same model that was included in your hardware and you got another variant, the vendor has made a mistake and you can ask for a return.