Late payment fine of 2019 and 2020 informed to buyer in 2022

Hi Sir/Mam I had booked an apartment in 2019 from a reputed builder in Noida and made all the payments to builder as and when a demand was made. Some payments were made a few days or weeks late such as when I was working on procuring the home loan for the flat. As of today All payments are made for which a demand was raised. I was always told that a few weeks late payment is common and I did not need to worry about a late payment fine. But it was all verbal. In April 2022, I was told a late payment of 53,000/- INR was pending against me. When I asked him for which dates were the late payments due, he told me that they were from 2019, 2020 and 2021. My questions are: 1) Is there an law stating under how many days should a builder notify the buyer about a late payment? 2) In my case, since I was first told about the late payments dues of years 2019, 2020 and 2021 in April 2022 (1-3 years later), am I liable to pay the fine? 3) In case the builder does not comply, what legal remedy do I have? Thanks Ayan