Nexa — Un satisfactory service.

Dear all.
I had get service my car from your sec 8 dwarka service center but after service my car central locking is not working it was working fine before the service.. I have raised complent regarding this issue but your advisor is saying he cant do as he is not at fault..
Then who is at fault??
Why after the service the problem started?? How can you just get away. And why the issue cant be resolved i wonder. One of the most pathetic experience with you...
Please look it to the matter and resolve the issue.. If this is the attitude of yours people the god save the innocent people who take your service..
Looking forward some +ve response from your side.