Wow, that really sucks. I guess they figured they already have your money and you are stuck in a contract with no other options. Also, they probably thinking you will forget about this soon before the 18 months and you will renew with them again when another device hit market within that time frame.
AT&T Samsung Galaxy Note II(i317)
Samsung Galaxy S II & III
Retired devices: AT&T Samsung Galaxy Note / Moto Atrix and SGS Captivate / HTC Leo(HD2) / AT&T Tilt 2/ HTC Fuze / HTC Advantage / I-Mate JasJam / JasJar / Pocket PC / XDA
SAMSUNG CAPTIVATE AND T-MOBILE HD2 FOR SALE, PM ME IF YOUR ARE INTERESTED.
Tweaked TW JB 4.1.2