Nokia 5310 — Handset has not been replaced till date wef 20 July 2009.

I have purchased Nokia 5310 from Rajdhani Communication, Amapara Chowk, Raipur (CG) (Nokia Priority Dealer) Invoice No. 176 Date 09.04.2009. Nokia 5310 X.M Black MD-8 IMEI No.[protected].
During the month of July 2009 it was seen that the mobile on off switch is not working. I deposited the mobile set at the above shop and after three months they
povide me a handset of blue border one. The very next day I again compalined about of not charging at the shop. They checked and informed me that the charging point is not woking. They asked me to deposit the set to Nokia service center located at Lalganga complex, Raipur (CG) through the wokman Mr. Vijay. They infomed me that the set would be replaced within 15 days. I was assured by the incharge of service center. After my every queries the incharge as well as the workman has given me poor responses. They simply say no replacement has recieved till date.Today also they gave me the same reply. Now I wish to know what would be my next step to get the replacement from your side.