I'm not going to side with either of you here, but the truth will come out eventually.
The best, only option you have is to put up the original .blend file of it for us to see, not an imported .obj into Blender then, but the real thing. That means the file that you exported the .obj from. From that, anyone who has spent time to get down and learn all the ins and outs will know if you really made it. If not, its called hax by default.
Remember, this is the internet, so you are automatically considered guilty until proven innocent if questions arise, which they obviously have, and what I just told you you should do is really your only way to prove your innocence.