Put simply the agent provides money in the bank however it is not maintained.
Immigration has discretion/ability to overlook the financial requirements.
The agent will obtain extension based on retirement.
Many on AseanNow cry wolf about this and claim it's corruption etc.
That's a war of words been going on for years
Bottom line is that the stamps in your pp are legal.
If people have the funds available i pretty much always suggest that you can do it yourself without the use of an agent.
Without reading back over the whole thread, I think I recall that you did not meet the financials during the last 12 months.
If that's the case you would need to exit Thailand and kill off your existing extension (btw it's not valid) reenter and obtain new non O retirement and subsequent extension.
I would see an agent immediately.