Faulty Laptop

My sister bought a Dell laptop 01/02/2013 and from day one the laptop had a battery problem. She took the laptop back too Incredible Connection in Waterfront and apparently Dell came out and confirmed the battery was faulty and replaced it. However when she got the laptop back the same problem occurred. She the took it back to the store and they confirmed the battery was still faulty and after they had it for almost 7 months now they say the hard drive is also faulty, now the guarantee has expired and she didn't even have any use of the laptop and the item costs money.