Apple India — product issue

Address: Kamrup Metropolitan, Assam, 781001

Website: apple

I am a user of Iphone and currently i am using Iphone 7, 128 GB .
Since I have purchased this Series, it is so disappointing for me, i have given to service center thrice for repairing under warrenty .
Problem facing was mainly in display, ( Brightness automatic Up-down, Hanging Problem, battery issue ) .
Twice, the phone have been sent to Bangalore itself . but the same have been returned only by changing the display, But the problem consistently there. after that, i have called in your service center Bangalore . Your Adviser: Imran
Your case ID:[protected] .
He Advised me to Replace the battery and said that the problem will be resolved.
As per the given advice, i have changed the battery from the service center as well .
But even after that, problem persist.Your given contact no is not even reachable to me .
It is very shameful that such a big I phone Company, but it is not able to resolve my Problem .
I have went to service center 4 Times . Twice phone have been sent to Banglore also.
What next ???????

Now, its not possible for me to give the phone again and again for servicing .
Now its the duty to replace the phone on urgent basis.
I dont want any further servicing .
I need the replacement, .Again and Again i need to call to the service center and they say, that they will call me back . But they never do the same and fooling me.