Techyuga - Made my mobile dead

I gave my mobile phone for repairing, in my mobile only had network issue. Once I submitted they told me within one week we will let you know the update is it possible or not but after one week I did not received any updates from them. I emailed, I called them they just told not any update for you. I emailed them so many times but when I did not get any responses. I called and asked to back my phone as soon as possible, then they sent a boy with my phone as dead condition. I did not received it and told them that I need my phone as it was, still now they have sent any idea, blocked my number and not answering my email.