... you bloody sub-contractor! Your progress is slow, how can I pay you so much? If you keep calling me, how can I do up your claim???
Complain all you want but I ain't gonna budge. What I certified I have certified. Beg all you want but this is all you deserved to be paid. I am trying my best to jack up your payment, which is NOT easy considering your progress is so unsatisfactory.
Incur my wrath and you will suffer.