Hitachi / Window Ac — regarding unsatisfactory service

The Service Request number is – [protected]
Machine Details:

Model :RAV018EQDZ1
Model Desc. :WINDOW AC - 1.5T CLASS HITACHI QUADRICOOL (TM) - R
Purchase Date :06/04/2010
Purchase From :DATA CONVERSION
I made a complaint for my Window AC on 5 August and since then it is lying in the service center. How will I get my AC back? Almost 15 days have passed and no response has been received.Help me to get my AC back. This is the 6th time I am struggling to get my AC repaired from HITACHI. Even for one season it didn't work properly. Since 5 August '13 AC is in the service center and we are not getting it back. I was told cooling pipe is to be replaced.Someone says its coming from Thailand and other says its on its way from Gujarat.I dont think neither of the place is so far that it takes 15 days to reach Delhi.let me know how can i get my machine back as early as possible?.....................POOR MACHINES AND VERY POOR SERVICE....................DARE NOT TO BUY HITACHI.
The AC was in the name of Pushpa srivastava
Regards
Neelu Srivastav
B-306, Sector 19
Noida