You have been mentioning in all the lines that you have been told something whereas what is written in the BBA is different to that of the one assured orally.
It is really pitiable on your part to follow the words of the agents blindly.
It is a universal fact tht the agents throughout the globe will bluff and will create an extraordinary image of the product they are trying to promote.
The gents are meant and shall remain only till the deal is completed between the buyer and the vendor, once their commission is paid, they will abandon the scene leaving the buyer to toil in lurch.
The same thing will happen in your case also.
You catch hold of the agents about the promises made and about the payments already made and to get it clarified from the builder.
In case you are no more comfortable with this purchase, you may even decide to cancel the agreement by sending a notice to the builder intimating your decision to cancel the agreement owing to the contradictions observed now from the assurances given by the builder in oral to that of that of the conditions appearing in the BBA.
If the builder is not responding or not cooperating then you may issue a legal notice and after tht you can drag him either to RERA or to the consumer forum for relief and remedy