Lenovo — Poor service team/ no revert on the complaint email/no revert from customer care

Address:	Mumbai City, Maharashtra, 400079
Website:	Support.lenovo.com

I bought a Lenovo smartphone 2 months back, there were issues with the brightness of the screen; Initially I ignored it but on 18th Oct the Screen got blank.
I tried to contact the customer care no. from where I didn't got any satisfactory response. Somehow I found the service center and simultaneously I wrote to Mr.Gosh ( the All India head of Lenovo service team), he in turn directed the email to his team but I have still not got any revert from them. Moreover I have been calling to the service center team where I have given my phone for repairing, the only answer I get from them is that my phone will be repaired in another 2-3 days. I am being mentally harassed by the behavior of these people.
Please help.