India Infoline Finance [IIFL] — Home Loan Property Allotment Change

I purchased a property from TNHB Self-Finance Scheme and the loan was taken from IIFL.

Recently there was a new allotment change as per TNHB rules, due to which my House block changed from C to D.
On March 1st 2022 - I had visited the Home branch ( TNAGAR: CIT, Chennai. To officially raise a request for Home Loan Property details change.

The team had taken the original hand-written request and allotment letter from me. And requested me to visit after 1 week.
When I visited after 1 week, they said that the documents I have submitted is not received and looks like somewhere they missed them. ( now, my original allotment letter is missed).
They acknowledged accepting requests via soft-copy and I had to re-send the details over email.

And they asked me to visit again after 2 weeks and told it will cost Rs/10000 for the change.
After 2 weeks, there is no update on the progress.
Till now I haven't heard anything from them, there is no clear process, nor Estimated Time, or no request number either.
Everything is just managed without any procedure.

I tried reaching customer care and i tried to reach them over the phone at [protected]

My Concern.
- Unable to update the property details in the home loan. - No proper procedure.
- Team had missed the Original documents I submitted for this process.
- Unable to perform Registration of my house, since they aren't giving NOC
As a normal customer, I do not have any choice rather run behind them again and again.

I ready to take legal action.