When you want to quit because it's just not worth it
It seems like part of the problem with procurement was not clearly illustrating that a discount had been applied after all.PM: Well I’m going to need some kind of discount. How about 30%?Me: As it says on our website, we don’t discount.PM: But I’m buying 400 seats!Me: Yes, and we already provide a nice discount for bulk orders, which is already included on the invoice and documented on the website.I.e. he was wrong to say 'we don't discount'.  The answer is actually - 'yes, I've already applied your discount.  Because you are buying so many seats, you get our discount of x%.  If you bought another y, you'd get z%'.  Sounds like it could have been communicated better.