If you worked with an agency to get your DTV, work with an agency to get your passport changed at immigration. Without an agency they might ask for your up to date financial information and if it isn’t perfect it could turn out bad. Use an agency.
Buildings in Bangkok don’t stay new and in good condition for very long. Between the heat, the humidity, and the mold, and the advent of new bigger better buildings constantly being built and their units pre-sold for discounts, a condo in an older building is just not as attractive to buyers in the future. I lived in a building that was 10-15 years old and it was already falling apart and took constant maintenance.
Go back to the same immigration office at the airport and get it resolved, make sure they load the info into the computer if it hasn’t already been done. That’s what I’d try for.