I have lost R3999 for something that doesn't last

I bought a brand new Hp laptop in Game store pinecrest for the purpose of campus online modules,today it is like a toy,it doesn't work,if it come on it will switch off by itslef,I went to Game about for times they book for a service when it came back they says from the IT department it will gonna work problem has been resolved.Last time I go back to Game and tell them that I do not want that Laptop again,it give me the same problems as before,the technician on last day for service they makeup stories,of which I don't know it because they were tired of me and my laptop,they said on their repair feedback my laptop has water damaged of which I do not know where it was coming from,they asked me to talk to Game manager for refund or exchange,,they can't assist me,I did so spoke to Freedom he stick on water damaged he can't do anything for me and he left me talking to him.Their Laptop doesn't last me even a year,I have to buy another one.Game service is bad,their products are fongkong. They care when you come with your money they don't care about you when you have a problems.I hate that store very much,I've lost my money for nothing.don't wish any of my relative to support their business