Micromax W900 — New defective Mobile ( W900)

Address:

East Delhi, Delhi

Dear Sir,

I have purchased anew Micromax W900 mobile set, dated 14th June 2010. But It was a defective set. 15th June they said "it is software problem, you please come next day. Next day day ( Evening) They said microphone is out of order and You should come after 11 am and before 6 pm.
17th may I met there and they said they will repair my moble hand set. After severel request they are not listening anything.

My question is , what should I do ?

Should I complaint for this?
Please guide me.


Shop detail:
PRINTRONIX
Shop no S-529
School block
Laxmi Nagar
New Delhi

Bill detail :

Sale No. 2229
Document date: 14/06/2010
Name : A Das Gupta
Delhi
Mobile No : [protected]
email id : [protected]@gmail.com

Thanking You
Anirban Das Gupta