Karbonn — faulty handset

i hv bought my handset on 9/6/13 and since then the handset has an issue of voice clarity. i have tried to reach the company helpline on the phone on cust service no . for around 100 times bt the number seems to be busy always. i hv also reached the service center but they failed to provide me solution. second time when i submitted the hands to the service station they hv now claimed thst the handset shud go to the company for nrepairing and will take 40-50 days to come back. the voice of my handset doesnt reach clearly to the person to whom the call is made. Request your help to get this resolved.