Lenova — laptop performance is too slow from day 1

Address:	560076
Website:	Croma

I had purchased the laptop a year back in croma and since that day i had visited croma more than 6 times regarding the issue that the laptop is not functioning properly, store people collected the brand new laptop and had sent to the service center and had done speed test still no luck, worst performance. And later after some days they had done reset to factory settings, still no luck, even worst performance. I had lost hope on the performance of the laptop even after several visits to croma as they are helpless.
So i just want to return this default product to the default manufactures so that they can do wat soo ever they want. I just guidance to do so.