Vodafone — Rs. 1000/- refund pending since last 1 yr

I had a prepaid no of vodafone on which i got a call a year back from Vodafone center to change it to postpaid in 998 yearly rental plan. I agreed to change prepaid to postpaid connection and so that person had sent his executive to my place, who collected rs.1000/- from me saying this will reflect in bill and had given a sim which as per him was to start in 24 hrs.
He got the CAF form filled from me.
after 2 days when that new sim didn't got activated i called to that person and he said that pre-exiting prepaid no cannot be converted and so i have to take a newno. i ased him to return the amount and get the sim collected. there after neither he sent his executive nor cash and neither even had taken my call.
I made complaint to vodafone store at Karol baghand they assured that this amount will get refunded in 25 days whereas now even after 1 yr, i hv not got that amount or any confirmation else than that the amount was taken by arjun enterprises which is a franchisee store of vodafone.
Had made many complaints to karol bagh branch of vadafone but nothing turned positive