let them have it....if they want it
and macdonalds money.
pay peanuts, get monkeys.
theres another old phrase,
send them a letter, emphasising how professional you are, that you are sorry you could not be of service this time,... that your standards are high, everything would have been double checked....bla bla bla....
and to ring you again ....when the monkeys have eaten the peanuts
and cant afford to work at them prices.