For this issue there are parts you can replace. The front earpiece speaker which is together with the headphone flex cable assembly. For the microphone, the issue you're having points to the bottom microphone which is behind the charger port daughterboard.
Make sure you buy the correct model of the phone part as if you get the incorrect model for the charger port daughter board, you will have issues with reception and sometimes charging the phone.
Where to get the part. If this one doesn't match your model, then search for the one with the correct model no.
Charger port flex cable assembly:
http://www.ebay.com.au/itm/USB-Dock-Charger-Charging-Port-Flex-Cable-For-Samsung-Galaxy-Note-3-N900A-GS-/252232560980?hash=item3aba3b7154:g:QMMAAOSwAKxWVACE
Front headphone jack with ear speaker cable:
http://www.ebay.com.au/itm/New-Headphone-Jack-Ear-Speaker-Flex-Cable-Repair-Part-For-Samsung-Galaxy-Note-3-/141622587365?hash=item20f95d2fe5:g:bvUAAOSwBLlVGnJQ
Guide on how to open to where you need to take the part out:
[guide|19209]