Union Bank Bank Account Or Service Complaint

Union Bank Bank account or service department,

Checking account Making/receiving payments, sending money California

I received a money order for a piece of art. I took it to my bank and they told me the check was good and I would have access the next day. 5 days later they withdrew the money from my account and said the money order was a forgery. I expected my bank in this day and age to know a forgery and let me know before they made the money available to me. The last thing I expected was 5 days later to be told it was a forgery. I had been with this bank for 12 years. It was their responsibility.