How can I extend my stay to nine months using a six-month visa in Thailand?

So the theory goes. I have METV and have been in Thailand since August 1st. Extended by one month then did obligatory bounce. Coming back into HKT I was taken aside and grilled. My final day for entry this METV is January 24th. I was told by the I/O big cheese that they may not let me back in on the 23rd January which is when when I was planning on returning from home, to use up my allowance, so to speak. Plenty of coin, no issues, good clean living character, I really do not understand the hoo-haa.🤔