Acer — I received a product which turned out to be defective.

So i bought a acer nitro on june 2019 and as soon as i started noticing problem such as it's key were not working after one month o[censored]se. So i complained acer about this and they changed my whole keyboard of laptop with a cheap quality old keyboard.. I felt cheated as i don't deserve this.. But this was not it.. This laptop started crashing after sometime o[censored]sing it. Since then i have given my laptop for service 3-4 times but the problem has not been resolved yet.. I am really frustrated.. I want them to refund or replace this laptop.. I am a student and laptop is really essential for my studies. I am really disappointed by acer and such low quality. Even after explaining my problem to acer customer care and writing mails.. I didn't received any response regarding refund or replacement..
I hope i will find justice this way