Here's what you can do;

Gather Documentation:
Keep your receipt that shows you only withdrew $200.
Take screenshots or photos of your card records that show the $600 withdrawal.

Contact the ATM Provider:
Find the customer service contact information for the ATM provider.
Call or email them, explaining the situation clearly. Provide all relevant details including the date, time, and location of the ATM transaction.

Contact Your Card Provider:
Get in touch with H&R Block Emerald Card customer service.
Report the incorrect charges and dispute the transaction. Provide them with the same documentation.

Follow Up:
If you do not receive a response within a week, follow up with both the ATM provider and your card provider.
Keep a log of all communications, including dates, times, and the names of the representatives you speak with.

Escalate if Necessary:
If the issue is not resolved, consider escalating the matter by filing a complaint with the Consumer Financial Protection Bureau (CFPB) or your local financial regulatory authority.

Changing your name for business can be a great move if it fits your branding strategy and resonates with your audience. Just weigh the pros and cons carefully and plan the transition thoroughly to avoid any hiccups.