Why cant people hear me on phone calls after replacing my screen?

Hi! so my phone has recently been through the works. i replaced the oem screen with one from amazon because it broke. that screen was terrible quality so i bought one from this site instead. but prior to buying this screen from here i replaced my charging port cable because it stopped charging all together one day - also from amazon. Everything is installed at this point and the only issue with my phone is the top speaker wasn’t working unless I put pressure on it. Now that I’ve purchased a better quality screen from ifixit my speaker works! Yay! BUTTTTTT during phone calls people cant hear me, they say they hear 1 out of 5 words as if im going in and out. Now I’ve talked to siri, talk to text, video and voice memos and my mic seems to be perfectly fine. Why is it that people cant hear me?? i called myself from another phone and i can hear myself going in and out on the receiving end… help much appreciated!