Can I extend my tourist visa in Thailand after overstaying for 3 days?

The user has a 60-day tourist visa expiring on June 23, 2017, and wishes to extend it for 30 more days at the Chaengwattana Immigration Office, despite having overstayed their visa by 3 days. Responses indicate that they will need to pay for both the overstaying and the extension fee, and it is generally believed that the extension will start from the original visa end date. There are inquiries about the necessary documents for the extension process.