Call waiting services not working 😡 even I enabled call waiting services.bsnl 4g phone

I am not getting any notification are any tone as call waiting
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I am not getting any notification are any tone as call waiting
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Hi, kindly help us with the following information to find a solution to your query.
1. Â Name of the Asus device you are using.
2. Â Firmware version your device is on.
3. Elaborate more on your concern.
See if following the below steps help with the same:
1. Clear system cache.
2. Try the same under safe mode:
Hold the power button for 5 seconds => When the screen flashes with option => Press & hold power option => You will get an option to restart in safe mode