Iphone 6 microphone stopped working after screen replaement?

So basically I dropped my phone and shattered the screen && everything still worked perfectly fine. Thank god lol. Then I took it to get fixed and once it got fixed we realized the screen was loose and Siri and dictation doesn't work. Siri can't hear me. And when I have my phone on speaker they can't hear me either. And same thing with FaceTime so it's kind of annoying. This never happened before I got the screen fixed. I was wondering if this is permanent damage or if they can just fix it, I have a 3 month warranty so I can take it In anytime thanks

Take it back in to be fixed

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