The listing you found is six months stale. The price on the portal is not the price on the phone. The "premium" tag was bought, not earned. The RERA number is printed somewhere in the brochure but nobody expects you to check it. And the moment you show interest, four numbers you never gave consent to start calling.
None of that is a technology problem — it is a discipline problem. We built EstatePortal around a small set of rules and then refused to break them: publish the registration, publish the developer's own pricing, ask before we call, and say plainly what we do not know.
The result is a portal that is slower to collect your number and considerably more useful once it does.