Which real estate company are you dealing with rock? because even we happedd to come across the same clause in our contarct which we signed a few days back..that if we want to move out we have to pay the rest of the amount.Even we were confused on this clause.I guess its a new law....but when we approached a legal advisor he said its normal and nowadays almost all real esate companys have this clause and that in most cases if we give 1 or 2 months of prior notice we don't have to give the full payment.They are just making their side safe.

Time Doesn't Go.Time Stays - We Go.
Time Is The Rider Which Breaks In Youth.
I Have Wasted Tim - Now Time Has Wasted Me
Goethe