"When call is returned the number does not accept calls"
Never call back.
If a caller is legitimate, they'll leave a number and a message and they won't keep calling.
If the caller is a scammer, then the number may be spoofed, so if you do reach someone, it may be an innocent party or it might be a non-working number.
If the caller is a scammer and you do get a real phone number, then all you are doing is confirming that they reached a valid number - and they'll sell your number to other scammers.