What should I do if my income affidavit was not accepted for my 90-day Non-O visa application in Thailand?

The author has applied for a 90-day Non-O retirement visa at the Samut Songkhram Immigration Office but faced issues with the acceptance of their legalized affidavit from the Belgian Embassy. They are seeking advice on how to proceed, particularly before booking a return trip to Savannaket. Responses emphasize the importance of using the correct type of income certificate required by Thai immigration, noting that only specific documentation from the embassy is acceptable for the visa application.