Frustrated with my edge 60 pro

So my Edge 60 Pro which I have owned for about six months has a defect that I just noticed. The top microphone or the left channel sounds slightly muffled while the bottom microphone works completely fine. Because of that imbalance the sound mostly comes out from the bottom or the right side of the phone.

The main issue is that while the top microphone is technically working the separation is heavily weighted toward the bottom microphone. The top mic only receives sound clearly when the sound is very close to it. This is extremely frustrating. I originally thought it was a software issue so I reflashed it twice but that did not work.

I only noticed the defect after I bought Tangzu Wan'er iem as they made the imbalance very obvious. Has anyone else experienced this or anyone help?