Why isn't my screen working?

I got my phones screen fixed back before Christmas from this company. They did a great job and I'm pleased with their work! But, yesterday I went to get into my phone and it wouldn't let me type in my pass word. My phone works, I kept getting notifications and text messages, I even got my brother to call me to make sure my phone was working right. When my brother called me and my phone was ringing, I tried to swipe across my screen to answer the call and it was like my screen wasn't picking up that I was sliding my finger across it. And, when I was trying to type in my password it was acting like I wasn't touching it at all. I can't figure out what's wrong with it. I need help!