Saint-Gobain interview questions

Phone screen with HR, One-on-one interview with the hiring manager, followup interview with a panel of people from marketing. I went through this process, they said they would get back to me in a few days, but they took a month to get back to me. When they did get back to me, the offer was too low. I was VERY disappointed that they didn't bring up their extremely limited salary range earlier. They knew my salary history and expectations. This and their unprofessional lack of followup made it a negative experience overall, I felt like they were wasting my time.