My Mac crunches everywhere

I bought a laptop in January for study. He turned out to be defective. 3 months I argued that he was defective and I succeeded. To replace this laptop I was given a new one. He, too, turned out to be defective and they again refuse to return me. I do not want to wait another 3 months. I hate my laptop; it crunches in all places wherever I touch it. At the opening - a crunch, I just hold in my hands - a crunch, I touch the bottom cover - a crunch. Red spots appear on the screen from time to time. What am I supposed to do? Again 3 months to prove that he is defective? 14 days have not passed since the purchase, but they refuse my refund. If I pass the exams badly, then all my life for not enrolling in a dream university - I will blame Apple