"Is this <Bank Name> in <Town that's 20 miles away>?"
or "Is this <Bank Name> in <Town that's 230 miles away>?"
No, we're in <Our Town>.
"Well, do you have their number?"
I can understand the confusion with the 3 banks basically having the same name, even though we're not affiliated. But you found our number using Google or directory assistance or whatever. You can damned well do the same again.
In order to acheive harmony, one must know which strings to tune.