Nokia Care — Facing bad experience form service centre

Hello dear authority first of all i wish u all a very good day & let you telling my problem.
first of all i am going to nokia (microsoft) service centre on 4/09/2015 regarding my lumia 730.
my phone was hanging so much, speaker getting crash when calling or listening the music, sometimes touch is not working & connectivity of sim's network going off automatically after restarting the phone the internet facility of sim again going working mode.
a lots of problem i facing in many days & after finding time i am able to go service centre on those mention day with my warranty period.
first of they don't listen my problem properly & listening half of my problem they told me my phone's software is out of date & wanna getting update & this will fix all the problem, i say ok & paid them 100 rupees for this.after getting home my problem getting increased day by day & today again i visit the service centre, they behave me such kind of hell type.they don't listen anything from my side & telling me this is the fault of flip cover which was i put in my phone according to them.
how any internal problem will happened by this type logic & they told me if you want to complain about our behaviour you may procced we don't care anything.
how this kind of thing expect from your well known brand like microsoft or say nokia, i personally promote more than 100 of my friends & relatives for buying nokia or say microsoft.
i am feeling very much bad for this kind of thing how any renowned company's staff doing this kind of behaviour.in front of them i put my proof for my problem via screen shot but they don't look into this for a single second, they told me that i may b telling lie to them .how anyone blame us such kind of thing if they want to examine us then why not they keep "lie-detecting" machine.
now i want some solution of this because my phone's warranty don't have much enough left & they trying me to miss guide me.
now requested all of you sincere authorities to provide solution regarding this.
thank you all in advance.

here i send all the snaps for providing my proof again my problem what they don't try to understand & not looking into this snap.
in these picture you get my phone's imei no & my contact no is-> [protected]