justified or not, its the contract... agreed and signed by all parties

imagine u signed a 5-yr lease/rental for an apartment from... but then 2 years later the owner say 'Eyy..the economy now is bad compare 2 yrs before...i need to raise the rental'

is it fair or not? both parties agreed to the terms at the point of signing the legal document, dun cry fair/not fair after that

then by your argument, the Sulu can update the agreement and claim back Sabah laa.... coz that agreement was noted back in 1878 WAYYY more that 60yrs ago