What should I do if my tourist visa extension in Thailand was rejected but I received a 7-day extension?

The user reports experiencing issues with their tourist visa extension in Thailand. They had already extended their visa but were facing the imminent expiration, with their flight scheduled for the following week. Upon visiting immigration, they received a 7-day extension for 1900 baht despite being informed that the extension was rejected. The process was described as smooth, with no questions asked during the extension.