I purchase a laptop but was damaged

On the 15 dec2014 I purchase a Hp laptop at CNA southgate with that laptop was working fine for two weeks, on the 6 when I switch the laptop on it did not respond so I took the laptop back to there store which one of the guy from cna told me he also had the same problem with his laptop but it only did it for less than an hour then they took my laptop and told me I will receive a new one in three days time they need to send it back I left my laptop there and wait for their call which I did not get until I return after 5days which the guy told me that they send my laptop to repair so have to wait again which I find it hard to understand its almost 5 to 6 weeks still I'm waiting for that laptop but nothing is happening it how can I spend so much money for something I can use really sometimes I feel like no one is will to help me cause at first that laptop I purchased it to use it not to keep it in cna