I'm not quite sure I understand, isn't there a written contract you sign that states exactly what you get for N amount of money? Paying extra because of insuffi

I'm not quite sure I understand, isn't there a written contract you sign that states exactly what you get for N amount of money? Paying extra because of insufficient planning sucks, but is the price of such luxury. Think of the bright side; it's a good thing this bit your company at this early stage and not with half a million dollar contracts.