HTC — Status is not providing

Address:

Hyderabad, Andhra Pradesh, 500096

I brought a new HTC Desire phone on 1st December 2015 and it has battery backup problem. I have submitted the phone in Service center on 15th December. They have given date 19th Dec to collect the phone. I went to service center on 19th Dec they said phone is not yet repaired and it takes 5 days more. I asked how many days still it will take to repair they are not providing any status of it. I would like to get my phone to be repaired soon and give it back to me.