I Need resolution not excuses!

I bought a laptop at the Westgate branch in January the item starting giving issues so I took it to the Cresta branch. The laptop started making random beeping sounds,flickering and blanking out when I used it especially with excel. They took it in for repairs and apparently replaced the battery. Nothing changed the laptop was worse than before and also the battery would drain faster than before. I took it in the second time cause nothing was fixed. Upon collecting it the second time they told me they had replaced/fixed the screen. Took it home same day it's stick flickering and going blank and the battery still the same. I emailed incredible and they told me to take the item in to be looked at. I'm tired because I use the laptop for work so I'm not understanding how many times I need to take it in for the same reason and nothing being resolved. I haven't received any assistance and this time I either want another laptop or my refund cause I can't keep taking it in for the same issue and I get the machine in the same condition meaning it's faulty period.