For a solution

[ND256]

How to off the calls auto rejection on Galaxy J7pro

[nipoo]

I'm not using the same Android version. But method is same.

Go to phone app.
Then tap on three dots in upper right corner.
Tap on settings.
Tap on block number.

Remove numbers you have already added.
Turn off the feature Block unknown callers.

[MadhawaB]

# Open the Phone app
# Tap on the Menu ( upper right coner)
# Select settings and Call
# Tap on the Call rejection
(list of numbers view you added on the reject list)

[Cheers_bruh]

Those 2 comments are the best solutions you can get.... so accept them .☺