Hi HE,
Dealing with bank feed issues after replacing your credit card due to scammers can be a hassle. Since your old card was linked to the “WBC Visa—Business” account, it's understandable that you're seeing that message. MYOB doesn't allow the same account to be linked to multiple bank feeds.
You'll need to set up a new liability account for your new credit card in MYOB. Once that's done, you can link this new account to the bank feeds. You don't have to zero out the old account right away, but it's a good idea to make sure everything is balanced and reconciled before making the switch.
Feel free to get in touch if you need more help.
Cheers,
Princess