Consumer Redressal

Purchased 1 sony 3000 mah power bank for mobile on 17th July 2014 from Reliance Digital at Himalaya Mall, Bhavnagar. Reported not functioning of the device to Sony Service Centre at Bangalore RT Nagar service centre on 17th November 2014, they agreed to replace the product but time requested was 7 days for which I could not agree since I was on official tour there and was not in a position to wait for 7 days. Requested them to give a inspection note, which they refused. On my arrival at Kolkata, I took the device on 29th November 2014 to the SP Mukherjee road service centre, where upon waiting they said the device is working fine and is charging the mobile which I found consequently upon handover to me. I pleaded them to thoroughly check their answer was you need to wait for 7 hrs to finally check the workings. Now as it is the device is getting charged for hours but not getting fully charged and the output is very negligible, only for 10 mins of backup power. Please look into it.