Screen broken by customer service

Dear Sir,
When I went to motorola service center for my phone which has some screen issues. They take the phone inside office for check the issues but during checking they broke the screen of mobile. when I said that it is broken they did not accept it. When I ask for cctv footage for clear cut they ignore it.
Dear sir please do the needful. It is very poor service given by motorola
service center. Now they are asking for service charge to replace screen
while they have broken it. My phone is already in service period.

Thanks & Regards
Arya Kumar
Mob:- 9128281055, 9507999253