Nokia India — too late service.

I had given my Nokia 6 to Nokia care center alappuzha 3 weeks before to change my phone's display.They haven't given my phone yet.They agreed to give my phone last saturday.Bt they haven't.They are not answering my call.I have been calling them for the last two working days but they don't answer.I didn't expects this from Nokia.So bad servicing.When I enquired about the center, I got bad feedbacks.They provides worst service.So I bought my phone back.