Karbonn Mobiles — I have made numerous visits & multiple phone calls but in vain

Dear Sir,
I had purchased S5 PLUS from amazon.com online on 17/06/ 2014.. This phone did not work properly even for one month. I found this phone was not detecting sim card & the display was flickering. I handed over this phone for repairing to Anuragni Electronics in Noida on 12/07/2014. More than 1 months has passed but phone is not repaired. I have made numerous visits & multiple phone calls but in vain. They say the phone is at the company & the part is not availableThe details of mobile is below –

Job Sheet No: KJASPUP422714K1489,
Model :S5 Plus,
Customer Name: Gaurav Arora
Dual Sim Phone IMEI No’s
IMEI No:[protected]
IMEI No:[protected]


I am completely dissatisfied with the product and service and I want my money back.