Bhartiairtel
Efund not recieved

I had taken a airtel connection on 26 jan a salesman sold it to my place it was NEW GOOD VALUE199 PLAN my number was 9987528053 . it was post paid i converted it into prepaid on 10 june now i want my refund back of 500 rs . for the last 1 yr i am going to airtel at fort but i have not got my refund back