他們為什麽closing的時候沒有算對？that's their job.

告訴他們政府收的錢你付，剩下的雜七雜八的費用你不付，商量個少點錢好了。

You'll pay whatever tax they paid to the government.  For the other service fees, they didn't do a good job at closing, so you are not paying those fees.