Multi asking for extra charges on B17G plot

Hello everyone/Salam,

I bought a 25x50 plot in B17 G block. Now since the last few months, society management is sending me messages to pay about 5 lakh in charges as they increased dimensions to 25x54 and also added 10% corner charges. The plot is a regular plot but they said that as front and back is open, these charges are levied, back side of plot has a rainwater channel. I am abroad and as an overseas Pakistani very stressed by this situation. I have paid all installments including possession charges. What is going on and what to do in this case?

Anybody can help in this matter? Should I talk to a lawyer about this? Any recommendation?

Dear brother give a request to society to make easy installments of it so you can pay it quarterly
Bcz eventually you have to pay it.