Anonymous participant be fully aware that you will need all the documents you originally applied with updated. It is much easier just exiting and returning.
the staff at hospitals have limited English skills, but not the actual doctors. You need to talk to the doctor directly, not anyone else. The doctor will know what a treatment plan is. Go back to Thailand, and make an appointment with your doctor. That is what you need to do. The cost of what you would spend to enroll in enough Muay Thai classes, now at 6+ months, would easily pay for your flight back to Thailand to meet with your doctor.
One simple question. Did you submit a written treatment plan from your doctor, or just past appointments, as it sounds like you did? If not, that is why you were rejected. You need a written treatment plan from your doctor. With that plan your approval greatly improved under the medical category. They don't care at all about how long, or how much you've spent, or that you have insurance. They only care about the written treatment plan for your future treatments.
Anonymous participant 825 usually you pay taxes in your passport country, or the country the product is actually sold in, and in some situations in both.
They sometimes ask for a copy of "all" your passport pages to check if you are still in the country. They usually ask that when they think, for whatever reason, that you left the country
How long was your money in the bank? Three months there seems to be the minimum. They also asked for documents you couldn't provide, and most likely why you were rejected, no matter what explanation you gave. They don't deal with excuses.