Back in March, I had similar problems with the I.O. -- maybe the same one, quite young, I would guess in his 30s.
I was renewing my extension based on THB800,000 in the bank. He asked me for my live-in girlfriends I.D. card. Her name, along with mine, is on the lease. He also asked me for my Landlady's I.D. card. I told him that I didn't know where she was but he sent me away saying "try to get it!"
He had NO right to demand these items under the money in bank method --- only in the monthly income method, according to their own notes which I had earlier collected from the side office.
When I returned the next day with a photocopy of my landlady's details, he didn't even examine them but just put the copy on top of the printer. I said, "If you're done with that, may I have it back, lest you ask for it next year?" He gave it back to me and asked for a load of bank documents, whereupon I told him that he'd had them yesterday!
"Oh, OK he said, go and collect your passport at the next counter.
I'm convinced that they make up their own rules and simply try to make it as difficult as possible for us because they know that they're not getting any agent's backhanders.
This was my first time doing it on my own but, traumatic as it was, I'm still doing it again next year. I will be armed with experience from my visit this year and will make a point of NOT showing the I.O. anything which has not been asked for. Under the money in bank method, I should never have let him have sight of my lease.