Let me see if I have this right. You got a $4000 frame for under $900? Is that correct? In other words you got a frame for over 75% off. Did you expect it to be perfect? It was used. There were going to be problems with it. Other than that, the frame sounds like a steal.
You, on the other hand, sound like a whiney, cry-baby brat. There have been some GREAT suggestions posted here to help. If the frame fit, I would buy it. Being a used frame, the buyer probably knew that it was still ridable and assumed that a "normal" person doesn't expect a mint condition frame at under 25% of the original value.
You bought a piece of merchandise. You made a deal. The frame is not perfect, but it is what was represented. If you are upset, cry us a river, build a bridge, and get over it. Sac up, be a man, and deal with the minor problem.