Illegal Demand of past maintenance charges by Society for Mhada apartment

I have been alloted Mhada 2014 lottery flat recently in July 2023. My name was in waiting list since 2014 and after long waiting I have received provisional letter of allotment from Mhada as I have paid all payment in time and successful allocated apartment. After payment and allocation of flat when I have approached society I been ask to pay Rs. 6.5 lacs towards old outstanding. Though in my provisional letter for allotment from Mhada no such clouse was mentioned for me to pay such old maintenance charges. Surprisingly I found the one old maintenance bill of May 2022 and that was for just 27K only. Now society is saying previous committee might have mad some mistake but you / Mhada needs to pay total amount since 2018 with interest even though Bill have raised just after I approach society for membership soon after flat registration. I need guidance on below : 1. Can new society can demand such additional maintenance charges since 2018 claiming previous committee errors with interest even after all Balance sheet well audited and approved in AGM? 2. Even if this is an error they have right to recover interest since correct bill was never issued? 3. As per my knowledge Mhada should pay due amount since was not mentioned as my obligation in provisional allotment letter Request your guidance