as long as you paid 12 months, it is equivalent of you staying there 12 months. U do not have to be 'physically' there. Unless u paid 11 and 1/2 month then of coz deposit forfeited.
no point complain to management. Agreement is between u n owner. First you can make a police report. Next is find lawyer sue. other than that, nothing much you can do. Do not make threat like will damage his house etc..just say if you want to go legal way then you will do it.
First go print out the deposit statement of your last month payment. Next , get a lawyer advise.