Deloitte salary negotiation confusion — HR says my number isn’t possible but final approval is still pending?

Hi all,
I cleared Deloitte India interviews (SAP role) and had the HR discussion two weeks ago.

I asked for 16 LPA fixed, but HR said that she needs approval from leaders After multiple calls, today HR is saying that they cannot revise my compensation and they will give 15LPA as CTC(what she offered 2 weeks ago) and she also said that they are waiting for final approval and she will update me once leadership approves.

Now I’m confused if they are fixed on what they are offering then why still final approval needed. Do i still have a chance to get approval for 16LPA as fixed?