April Hudson, The first thing you may want to try is cleaning out the earphone jack on your device and the small mesh screen on mic.. Lint/dust/debri can get lodged in the port, not allowing the connector to make good connection, use tooth pick to try and clean jack out and then retry mic.. 1st link below is a tear down guide which can get you inside the control/mic to see if there is ant evident wires off or damage that you may be able to repair. The other 2 links are just a little more info. on trouble shooting earbuds/mic.. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
[guide|10501]
https://www.engadget.com/2009/08/13/your-headphones-mic-not-working-dont-sweat-it/
https://support.apple.com/en-ca/HT203026