How do i unlock my samsung behold 2?

okaaayyy so i got the samsung behold 2 for myself about 10 months ago through tmobile contract. now, i kept the service alive for about 4 months, and decided it was too expensive, so i canceled it. now the bill is 800$$ (for 3 phones, btw). so i call them, and they say i cant switch carriers without an unlock code? so i ask them how to get the code and they say i cant get the codes to unlock any of my phones (Blackberry curve, Samsung Behold 2, & samsung gravity t459) until i pay them the money. so i was wondering how i can find the codes to unlock them to go to another service free of charge. HELP!!!!!!!!!!!!
P.S. the phones are not currently activated if that makes a difference

If you are not able to get the unlock code for any of your mobile phone, you can try to get them from any private source. For example, you can visit SuperUnlockCodes.com to get the unlock code at affordable cost with an easy unlocking guide. Good luck.