Lenovo — Need refund or exchange of lenovo laptop

Address:	Pune, Maharashtra, 41014
Website:	www.lenovo.com/in/en

I have purchased Lenovo Ideapad 500 15ISK, i5 8gb ram 4 gb graphics laptop on 17th of march 2016, from Baba computers, pune. From starting camera was not working, After 2- 3 days i got msg that startup menu and cortana stopped working so i was unable to use any feature on laptop so had to reset it, then i thought problem was solved but after that display automatically started to vanish, then i took technical help from micro soft using remote assistance for 5 to 6 times on 28th considering it is software problem but problem is not resolved so then i took my laptop to lenovo service center they did one key recovery which was one 29th but still laptop was working slowly and i took technical help from lenovo they asked me to update bias i did that but nothing happened. I have done everything one key recovery, updating bias, updating build, resetting, installing windows, formatting performing small troubleshoot tasks ... litterly everything within this 15days but had no solution.
My laptop is not working properly since day 1 it is getting forcible shut down, i cannot even work for 1hr straight, it has been 15 days since i bought it that.
It is nothing like i5, it is very slow, if i would have wanted average laptop i would have bought i3 or something else, i spent 55k for a laptop for using it for lifetime not for 7 days or 1 month.
Also shutting forcefully couldn't be software issue. Lenono is saying they do not take any responsibility of software, why is that so, it is software and hardware both i have purchased it from same company
and now i want to refund, but they are not giving me refund or replacement because according to them they have 7 days replacement policy, although i called them within 7 days which is 24th and 25th to seek help but on that day it was holiday so i they didn't have any record.
Lenovo are worst service providers would never recommend it to anyone.