samsung galaxy s3 locked by t-mobile.

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http://forum.xda-developers.com – Please help me with this problem, i bought 1 samsung galaxy s3 t999 of t-mobile from 1 guy on craiglist.com 3 months ago, for the 1st 3 months, the phones work fine, but just last 4 days, my phone can not call, text or internet (i used prepaid plan $50/month from t-mobile), then i called t-mobile technician support 5, 6 times, after all they said my phone locked by t-mobile, because the owner of the phone didn't pay the bills, they said my phone right now can not using anymore, except i can find the onwer, i tried some unlock code of some website on internet, but it didn't works, either, i hop (HowTos)