It works in the average situation, but unfortunately there are some huge scams happening(passing unnoticed) in undeveloped countries where somehow the scammers can hijack the number for a certain time frame.
If you call the same number the next day the real institution is going to answer, but nobody knows a thing.
Apparently, in some cases, they can hijack the phone number of an institution, but only for the specific caller that they are applying the scam. If someone from another context call the same number it goes to where it's supposed to be.
It's becoming more normal than ever down here... Happened next to me.
We are entering the age of personalized crime, targeted and framed just for you, considering your personality and necessities.