The user is inquiring about changing an expired medical visa to a tourist visa, which is not possible. They were informed that they purchased a 90-day medical visa extension and need to go to Thai immigration before it expires on December 25 to apply for a 60-day COVID extension for a fee of 1,900 Thai baht.
90 DAY REPORTING RESOURCES / SERVICES
Use the trusted Thailand 90 Day Reporting Service to get your in-person report done and mailed to you for as low as 375 THB (even if the online system doesn't work for you).
For immediate assistance, contact Thai Visa Centre directly via LINE at @ThaiVisaCentre or Email them.