Canon AE-1 Film Camera

I was excited to win this camera. I needed it for my photo class this semester. The person selling it said it was in great condition, only to find out it has a slight problem. I started my photo class, and found that all my film had these big black lines going through it after i developed it. I though maybe I had done something or it was the film. After the same thing happened to 4 more rolls, i took the camera to a shop called Kamera Korner. They just told me my new camera is leaking light, and it is quite expensive to fix. Now I don't know what to do. I just spent all my money on this camera to find out it is defective. Oh well. I guess that's what you get for buying used items online. Too bad.