Lenovo — lenovo k8 note motherboard issue again

Address:

Motorola Mobility India Pvt.Ltd, 12th floor tower D. DLF Cyber Greens, DLF Cyber City , Gurgaon -122002 ,Haryana India, Jalna, Maharashtra, 431203

From 8 july again started my mobile automatically restarting hanging heating vibrating i mail them on this issue they said go to service center i gone they check the mobile and said it has again motherboard issue, they it cost will rs.14335 of new motherboard and i said how it possible i purchased mobile with rs.12999 they said no it's company rate
I research 99℅ motherboard problem in lenovo k8 note by company by default it is fail product from company
I visited so many times but no solution i don't have trust on lenovo because last time they submitted my mobile without making jobsheet for [incident front camera not working after again visiting service centre ] i don't no they what did with my mobile
I said so many times refund me but no
This lenovo mobile! They cheated with me i all proofs jobsheets
They waste my time and money near by i gone 15 times again and again to your service center 70km from my city to other city
Very disappointed with the lenovo mobile. Please refund the amount or provide me new handset for this issue.