HTC — High irresponsibility from express service centre (Pradeep) in basavanagudi, bangalore branch

I had submitted my device HTC One E9S for repair for the LCD brekage on 19th Feb, 2016 at HTC Expree service centre, property No. 11/1, Pattalamma Temple Road, Opp. Pai Vista Convention Hall, Near Jayanagar South End Circle, Bengaluru, Karnataka 560004.
The person their told me I will get my device maxiumum in 7-10 days time.During those seven days, I didnt receive any call from the call centre/service centre.I was follwoing up continously and they assured me I will get a call back on the update.
Neha from repair team called me that I will get my phone repaired by 4th March, 2016 by friday.
However then I received a call from Pradeep from Service centre, Jayanagar that since there is delay in part availability for the original model I submitted, can they change the model whichever is available.When I said no and told that this is mental torture for customers, Pradeep shouted at me that I should talk to call centre or call on the torture number.
I want my device to be repaired by 4th March as communicated and an apology from Pradeep who shouted and misbehaved with me.
My whole family is using HTC since 10 years and people like Pradeep demean the whole brand by providing such bad customer service.