Lenovo — lenovo service center damaged my lenovo z2

Address:

Moga, Punjab, 142047

I had recently bought lenovo z2. Phone was working fine for me. One day i had broken my phone's touch (Although having gorilla glass & glass guard too) due my mistake. So, i went to ludhiana service center for touch replace they replace it. I don't how did they replaced the screen, within a few months screen was broken again in my pocket (I don't know how that time too glass guard). I keep that as it is. After few month i went to chandigarh service center for touch replacement they registered its problem description as "physical damaged handset, touch broken" phone was working fine. They keep my phone for touch replacement. When i approached them to get back my phone they said "your phone is dead (Hardly damaged)". Is it my fault? I gave them a working phone and now, they are saying your phone is dead... I have proof of receipt given by them. Where, the had clearly mentioned problem description as "physical damaged handset, touch broken"...