i'm chinese but from indonesia

here's the story, first time i came to singapore nov 2009, that time i came bcause my sister who lived here, was pregnant. and bcause of her husband work til 10pm everyday (work at shopping center), she asked me to stay and help her... and the scheme is, i stay around 25-28days a month, then go back to may country for about a week, and then come back to sg.. and this scheme work from nov 2009 til 21st july 2011...
and here's the problem...
18th july, because my SVP is almost expired, i go to BKK, and 21st july, i came back to singapore from BKK with Tiger airways, once at immigration, the officer noticed my passport got many stamp and she asked me many things, and i explained as well the true story.. and she escort me to a small room on the side, didn't asked me anything and we facing a big white computer, and my finger was scanned there (fingerprinted), i don't know it's to check my record before or to record my fingerprint for banned me from entering sg again

then she escort me to small waiting room that locked from outside.. after about 30 minutes waiting, and very tired (plus hungry, please note i hve breakfast at BKK at 8.30am, and flight to sg with delay, landing at changi budget terminal at 4.30pm without eating any other food anymore, and they keep me in the small room, without giving me any food to eat, i feel they are not human at all)
after that, she came and call me to officer desk, and they interrogated me there, and they didn't believe all my story, they said i stayed too long and too often coming, buit i answered that i'd never do something illegal, or overstaying, or work illegally, and always have legal return ticket, and a lot of money, even i shows to them my casino membership card, and what? they still didn't believe my story, and tell me that i must go back to BKK, i refused to go back to BKK, and tell them i want to go back to my country, and they said ok, but must pay around $500 (WTF!!)

and then they escort me to a place that they called "SATS office" but i read at the glass door a words "IP Lounge".
they give me a food, and all my stuff locked in the small room, even my phone, they didn't allowed me to phone my family there, it's really not human at all..

next morning, they escort me to the terminal, to take ticket, you know what? at the receipt of the ticket, the fare is $175, and IP lounge charge $268


after that i go back, and inside the plane the stewardess still keep my passport, didn't give to me back, like i'm criminal


now i know what many people say that sg officer is not human at all, yes i feel it....
but nevermind, since my tale in sg i met with some singaporean who very nice to me

but the question is:
- when i fingerprinted, it's for scanned that i'm have a criminal records or to record my fingerprint to banned me from entering singapore again?
- there's no stamp deported, WXXX, or any blacklisted stamp in my passport, that's mean i'm not banned or blacklisted?
- how long i can go back to sg? and if i can go back sg again, when my passport scanned at immigration, will it showing a banned record of me?
- and at the immigration card (white card), have a question "have you been prohibited from entering singapore", i must tick "yes" or "no"?
thank you very much