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Try booting the phone in safe mode and then check if the issue is still there or not.
For that, press and hold the power button when screen is on so that the option of POWER OFF appears on the screen. Then again TOUCH AND HOLD the power off option on the screen so that the option to boot in safe mode appears on the screen.
Select it and the phone will restart. Now check by making a call if the issue is still there or not.
Reply for further assistance.
Then how do you turn off your phone?
Then try doing the factory reset. But it will wipe off all the data.
Go to settings. Then Backup and Restore. Then factory reset.
Try connecting an ear-phone and then make a call.
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