Cheated by local retailer

Hi I live in Haridwar and my question is that i purchased a new assembeled computer from my nearby retailer in july 2019 for my school work. After using it for 2 months i see that it hangs a lot also it shows many errors and my school work was also disturbed.so i contacted many times to my retailer and after 2monts they repaired my computer. But after some time same problem arises then i complaint them .Then they said drop it in our store.They repaired and same problem arises finally February come and my exams come in 2020 and i get busy in it. And after my exams i am tried to using it but it does not work. Then lockdown implemented and they give a execuse for upto lockdown opens and in between of lockdown transition occurs but my computer kept on their shop.after it i got busy in my exams of 12th and jee and then college.so now today's what can i do also i came to know in 2019 july when i purchased the latest processor was 8th/9th gen intel but they cheated me and give me 1st gen i3 processor also ram of 2007 model in 2019 and much more.because it was internal product i came to know later and its hard disk is dead and cd player is alo not working.hence they cheated me as in the price i paid for newer generation they give me old product to clear their stock. So what can i fo now.