Hi Hayden,
I know how much sad it is. In your case, the problem can most probably be faulty equipment.
To fix the issue, you can try following methods:
1. Change other contacts to call the test.
2. As it is a Bluetooth headset, please reconnect the phone to the Bluetooth headset and try again.
3. Try replacing other Bluetooth earphones/wired earphones.
4. If there is still noise after replacing the headset, please backup the data (contact person, SMS, photo, etc.) to eliminate third-party software problems and restore the factory Settings.
5. If the problem still exists, it is recommended that you bring the machine, purchase invoice and package repair card to the local LG after-sales service center for testing.
Hope my answer helps you, and please also keep me updated, thanks a lot!