Cannot make calls or record voice notes or videos

I can call people but they can’t hear and I can’t hear them

I think it’s part of the charging port assembly. I just bought an iPhone 7+ from eBay they said it tested perfectly. BULLSHIT. when. I got it it had no vibration I couldn’t record or hear calls or be heard when calling. All I could:do was text. Then all of a sudden my charging port was too tight I couldn’t get my cable in and then suddenly it was too loose. Back and forth. So I ordered a lightning port assembly since it covered all those issues. However, I’m stuck at a stripped screw someone previously had their way with. The Taptic Engine cable was severed and missing all its screws. And the loud speaker missing half its screws. I found those screws and more inside the phone. But this is just my thoughts on it. I had the same HAVE THE SAME problems. I was told after researching that it would be the most viable option Lightning Port Assembly. I changed the battery out first, had I known this would happen I would have retuned the battery. I bought both from Amazon for $37 with tools that are not up to par. $ 10 for the port assembly