Apple India — can't hear the voice and caller tune and can only hear if i once on and then off the speaker

Address: Surat, Gujarat, 395007

Hi i am deepika bengani and i hav 6s and it's been more than one year i hav been facing the problem and i went hundreds of time to the ivenus service centre and they checked my cell many times and even replaced 4 times then i got a new cell with a new warranty bt then too i hav faced the same problem and the service centre people say they can't do anything and the apple care people dnt gimme a resolution.
I am a patient an. I can't tolerate such stress so nw i m filing a complaint in the consumer forum.