No respect for other peoples property

I've got a Samsung tab 3 10.1 inch. Earlier last month the tablet started switching off automatically. I've contacted Samsung South Africa & they advised me to take it to their repair center in Woodmead. Tablet was handed in on Saturday 21/02/2015. The lady who was assisting me turned the tablet (screen) on the table surface causing this to get scratched and still has the nerve to ask me if my screen is cracked. She scratched the tablet right in front of my eyes on the table surface!!! What unprofessional staff dealing with customers property. I was told that the device needed a software upgrade. I collected the device later the same day and upon returning home i discovered that my tablet had an additional scratch as though the screen was removed. If you were updating the software why open up my device?!?!?! Anyway, the point is that the device still has a problem and I'm scared to even take this back because i know I'll get it back in a worst off condition. I take good care of my property as is still has the original plastic on the back. Do you not send your staff on training? Devices should be handled with care. Please revert back as to how you guys are going to accommodate me