Asus laptop keep having to send

We purchased an Asus on the 28th Jan 2021 our daughter doing homeschooling. On the 15th July 2021 we took laptop back to Incredible Boksburg as the port to laptop not working. Apparently they replaced the board. Waited 3 weeks for it's return. Now laptop has come back even worse, screen flickering and extremely slow. Sent it back once more and still no feed back. It really feels like no one could be bothered at all this was a brand new laptop. This has really put us back as our daughter has now to share her father's laptop of which he uses for business purposes. I really think laptop should be replaced as within the 6 month's.