Not sure you can find a bank open in a mall right now.
You have to watch the openings.
In HUA HIN, according to the latest news, banks in shopping malls are closed.
As for opening 1 hour or 2 hours before, it seems to me that there is a bank near Market Village (towards the center, on the left and another towards the night market)
But to verify.
It changes every day.
Good afternoon