How can I correct my bank account details on Shopify?

Hi all, when setting up my Shopify store, I may have incorrectly put in my the wrong details for my bank account. I am now receiving and error:

To change your bank account, make the following changes:

Old account must match the information we have on file. Contact support if you need further help.
The problem is, I can’t match the old information as I don’t know what error I made.

when i attempt to change the info obviously it was entered incorrectly and is asking for previous banking info. i have reached out to shopify multiple times and its frustrating and im about to close my store.

Any suggestions on how I fix this?