Poor customer service

I had a 10"tablet screen replaced with v cell clinix in the bluff, Durban. After 2 and a half months the touch screen gave me a problem. When I took it back to the shop, they said it was a software problem. I had the software updated. But the screen was still a problem. When I went back to the shop, the guy refused to help me. Said I came 4 months later and these no guarantees. When I had first paid for the repair the first time there was nothing said about no guarantees. But if the screen is not cracked and there is a problem, they will cover the guarantee. Clearly this is not happening