Karbonn Mobiles K 330
Speaker phone not working. My voice not audible to other party

I bought KARBONN (K330) mobile on 16/04 in hyderabad.

From recent 3 weeks, my mobile's speaker is not working.

When somebody call me, i can hear their voice but, they are not able to hear to me.

Wanted to go for service center, but due to academic exams, i have not been.

Really not satisfied with my mobile.