The tenancy is btw owner and you, no agent involved?

The term of 1 year already stated wrongly, it should be 1/1/2015 until 31/12/2015 ( not 1/1/2016 )

And if u stay thru out these 12 months, u should be legally able to claim back the deposit. Unless the contract 1+1 and stated u must inform owner 2 mths before u move out regardless 11th or 12th month, or else deposit forfeite.

I duno why the owner so fussy and not willing to do so until change the lock and etc.

yup cannot change lock....

but TS, your story i feel got things u left out, whihc u duwan to tell us. pls be honest if you need help