Like yeah both sides have to talk the same language if I try to be smart saying it will take between 3 and 5 days - and management hears only “will be done in 3

Like yeah both sides have to talk the same language if I try to be smart saying it will take between 3 and 5 days - and management hears only “will be done in 3 days” I don’t care and next time go with just giving upper bound anyway, then they start negotiating and I give lower one and then they are still not happy I did not finish in lower estimate… That’s like not my problem anymore.