Hey there, @jackkhu
Bo here from Shopify Support!
When it comes to account-sensitive issues such as changing banking details it is always best to reach out to Shopify Support directly as we do need to authenticate you as the owner of the account in order to take a look at your account and help you make that change. I will be reaching out to you directly via email to authenticate you as the owner of the account. I will need you to respond to my email so that I can escalate this to our accounts team to resolve. These escalations generally take 2-3 business days.
In the future, to reach out to our support team please do visit the Help Centre. When on the Help Centre page, you should see Support > Contact Support in the main menu or there's a Contact Shopify Support button near the end of the page. The Help Centre will try and suggest guides first to resolve your query, however, if none of these suit your needs then please keep clicking the Contact Shopify Support button at the end of the page instead.
In some cases, Chrome extensions and cache can interfere with the Help Centre's login/authentication process and you might experience a "loop" when trying to contact our support. If this happens, I'd recommend clearing your cache or to log out of your Help Centre account and access our support as a guest instead as shown in this short video. Our advisors can authenticate the account later if needed or our Facebook and Twitter support would be happy to help instead. You are welcome to contact us here on Twitter or here on Facebook.