Nestaway Technologies — Unnecessary Deduction in Security amount of 11700

Cheating by nestaway-1. I am planning to move out of a nestaway home by May end. I have given notice a month prior to it. But it seems like they have changed their move out notice period from 30-45 during pandemic time. This was not informed to me and also it is not mentioned in my rental agreement. I am trying to contact them since 3 days regarding the same but all I'm getting is 24-48 hours time limit to get my query resolved. They are deducting an amount of 11700 for that period.
Also to you information, even if I would have tried to do that 45 day notice period thing, I was not able to because their team didn't close my move-in since 576 days. On my request and complaint they closed it 3 days back itself.
I have even wrote a mail to them on their request, but no information. I wrote on twitter bit still I got a useless response. So I'm feeling that they will not return my hard earned money and specially during this pandemic situation. In case if this happens I want a legal action against the company as I am reading many complaints where people have been cheated. I request to look into the matter at the earliest as I consider this as real cheating and looting done by nestaway