Your neighbors are just ringgit wise and dollar foolish, tidak apa attitude and ill informed. They will regret it later when they need that piece of paper for whatever reasons in the future. Nowadays, systems and procedures can not cincai cincai like the old days, even if things can gaotim also, they would have to fork out more money than what they would have paying now.
Btw, did you inform them there is a whitening offers by MPSJ right now ?
ur hse renovation involved any concrete slab? or just lower floor renovation only?