I got my screen changed!

It sounds like the people that "fixed" your iPhone screen really screwed it up and didn't know what they were doing. Either sue them or take it to Apple. Apple will definitely charge you more because the warranty has most likely been voided, but they can most likely fix it and you should also but a bad report to the company that "fixed" your screen to the Better Business Bureau and on other places. Apple will get it fixed.

If your phone was untouched prior to repair, It's very likely they messed up your phone in multiple ways.

If you're not aware, The Touch ID on iphone 7's has a connection to the original phone it came from, so if they possibly tore your Home button cable and replaced it with a new home button, it could be why your Touch ID (finger print) no longer works. They also could have messed up your microphone and screen during the repair. I'm not an expert really.. but for sure if your phone had never been opened prior to going to this shop, they definitely are the cause of it. That's an absolute terrible repair shop and I would complain beyond belief until they solved my problem, I really can't imagine how you're feeling now. So sorry Veronica.