Motorola servuce center Lucknow - Motorola service center lucknow is not repairing mobile under warranty

My Motorola phone was not working (power on/off issue), therefore yesterday I
> submitted it to the Lucknow service center ( Lenovo And Motorola Mobile
> Service Center, Address: Shop no. *, *st Floor * Park Road, Vaishal Acrade
> Behind Vidhayak Niwash- **********). The following points I want to
> elaborate:
>
> (*) First, their engineer opened my mobile and checked, and then one lady
> told me that your phone is under warranty and we will need *-* days maximum
> to repair your phone because it may be we have to bring some parts.
>
> (*) After this step, they generated a job sheet in which they mentioned all
> the details and service offering : In Warranty and told me that we will
> call you after repairing. Please find the attachment for that job sheet.
>
> (*) I called him today morning, she told me we will change your mother
> board so please give me * to * days and we will let you know. I said Ok
> fine.
>
> (*) Today evening, they called me again, and said that please come
> tomorrow, we need to discuss with you about your phone. I said why, then he
> told me we can not repair your phone because your phone already opened by
> someone.
>
> My question is that why you did not say these things on first day when they
> opened my phone and why you gave me job sheet in which you mentioned that
> we are offering you service under warranty.
>
> Now after times they opened my phone and gave me job sheet and after one
> day evening they said me we cannot repair your phone under warranty. After
> finding that they have to change the mother board of my Phone, they changed
> their decision.
>
> I will not go to collect my phone without completely repaired. I am
> requesting you to please take an action on this issue. I hope you will
> consider my application and resolve this problem at this level