Municipal Corporation Of Greater Mumbai — Rents demanded retrospective effect from 01/01/2014 by G/N Estate department.

Address:

Flat no 2, PUSHPA KUNJ, Mahim (w),, Above D Mart, Mori Road,

I had filled complain to BMC vide no [protected] and [protected] but no reply.
I have paid all rentals uptil November 2020. The rentals were approximately Rs 1500/- annually. When I went to pay in November 2021 i was informed that outstanding is Rs 29767/-. When i enquired i was told that arrears is from 01/01/2014. I got a letter from Estate department that because of Circular vide AC/Estate/19703/A.O.(A/C) of 28/01/2014 rentals has been increased by 5 times effect from 2014.
1) When the circular was issued in 2014 why was it was not implemeted in same year?
2) Why MCGM did not inform us about there is incease in rent. ?
3) Can MCGM demand rent from retrospective effect?
4) Is this justified. ? Was MCGM sleeping from 8 years?
I am ready to pay increased rents from 01/11/2021 till date but not from retrospective effect from 2014.

MCGM should consider my case and in pendemic it is very difficult to shell out huge figure of Rs 29767/- .