If there is a cause, there must be a cause of action accrued on a specific date before a cause of action can technically be construed.
What do you think give rise to a cause of withholding deposit when the duration of the 1 year tenancy has not expired yet?
Some may dispute on this but, do remember, that the limitation period for any possible civil infringement of law (which is none here yet) is 6 years.
This means, if there is any rectification, then, what breach of contract is there to begin with ?
Let me ask a simple question, does the tenant intend to continue to rent for six years when even before the one year is up, he is already thinking of backing out?
So, is there a cause, really ?
That is my view.