Lenovo A269i screen cracked?

I need help, I have a phone Lenovo a269i, it was bought last friday from a retailer, I had it replace just this morning because there's something wrong with the reboting. So I now have a new unit, just a while ago I connected to my laptop, then after a while I went out to get some stuff when i returned i checked my phone, the LCD was cracked or broken about 1/6 of the screen. I'm not sure what happened, I did not dropped it i'm positively sure, I wasn't sure if i sat on it… But i used a lot of other phones like SAMSUNG and other cheaper, locally manufactured phone here in the Phil. And I did sat down to some of them but it still okay. Now the problem is It's still have a Limited Warranty, Yes I read the whole LENOVO warranty thing. My question is do I have a chance to have my phone fix without paying for the LCD replacement? I felt very bad right now because i had it for just a day and now another problem… I'm never buying lenovo again…