Sony India — problem during calls

Address:

Rajkot, Gujarat

I have purchased Sony experia t2 ultra. Phone is under warranty. There is problem in speaker and during call, i am not able to hear properly what other person speak. I have already sent twice to the authorized station for Repairing but the same problem uccer again.this is the third time.n i m not setisfied with this product so pls Solve my problem immediately.service id is [protected].