I want my money or they must fix it at their cost.

I want my money from mobicell. I bought a tablet in January mobicell Zoom at Ackermans, in begining April the screen went blank. Ackermans sent it for repairs and then mobicell wants me to pay for the repairs and uet the tablet was sittong on the bed when it went blanl a quarter of thescreen and a few minutes tater the rest of the screen. They say ithas physical damages. The worst part is that they don't have it on the shelves anymore to show that the tablet has issues.