Sold a Defective Lenovo Laptop

I Bought a lenovo laptop on the 04/06/20415 from Telkom stores in Greenstone, after two weeks of usage I noticed they had actually sold me a defective item cause the screen kept on flickering... The flickering started of mildly then continued to be more aggressive as the weeks went on, It became worse to a point where I couldn't even use the laptop... I then decided to report the issue to the store and they advised that I call \LET ME REPAIR"their warranty guys... On the 30 July late at night I was working on the laptop and somehow the screen went crazy and the laptop went off... usually when that would happen I charged it and somehow that helped"