Your most realistic path is to call the bank and change the phone number on file. For that, obviously you'd need a fullz with the security answer. Don't be discouraged though; security questions aren't always very hard to answer (hint: social media, ancestry, etc).
One of the way is to replace the ownership of the number to you. It is possible if you have the id of the phone number owner, meaning you have someone in the telco. It's risky and can't do in bulk.