Was it like--
Baddy: Hi there, Oriol! How'ya doing? We've got a 60k word rush job for you, say, $0.05/word and we apply our almost fair discount greed grid... Happy to rat and get into troubles?--or you have some proofs (a contract/PO, official emails) specifying what exactly your client stated, what terms you agreed, and when you got an explicit go-ahead. So?
You: Goshly! I just can't resist! But I give NO discounts, you know. Yes? I have nothing else better to do, so count me in with pleasure! Go ahead?
Baddy: Sure, enjoy yourself! But we demand discounts, is it ok?
You: Absolutely! ? I will translate and proofread it as agreed, but I give no discounts. Yes?
Baddy: Ok? You are so awesome! Do begin, please! There're just a few days before the deadline. But with discounts only, of course!
. . .
IF both you and your client didn't specify in advance how the reps edit/proofread is paid, then you both did each other a disservice. Indeed, 'going by default' is but another traditional gimmick/ploy.)
Actually, taking a rush job without charging 150%-500% extra is a sad mistake, topped with infamous 'discounts' and 'freebies' by default.
@Richard, I'm glad for you, but usually such wholesale-price specialists offering discounts (even without being asked!) cannot distinctly answer:
Why do they deliberately cheapen their work? and
If they are [profit-oriented] businesspersons, how much did they lost (not gained) due to 'discounts'?, let alone
Considering the wordcount, don't most 'discounted' projects turn out a way under pity $0.01/word flat?