Public Consulting Group Project Manager interview questions

There were two interviews for this process. The individuals who conducted the interview were nice, asked your regular questions about my background and experience, interest in the job, etc. I was first sent a verbal offer via email stating they were waiting on HR to draw up my letter. About a day later, I received the official offer letter from HR with my title, salary, start date, all the info about my benefits. I had every intention of accepting. I thanked them for the generous offer and asked if the start date was flexible because of previously scheduled travel and also asked for a higher offer. This was in no way a demand, but a request. Instead of responding back saying they could not accommodate my request, they decided to say they were going in a different direction. This is the most unprofessional set of people I have ever come across. Any workplace that will send you an official offer letter and not expect you to negotiate any of their terms or to ask anything of them is a place I don’t want to work and neither should you. That’s definitely toxic behavior.

the interview was pretty informal. It felt like the interviewer was not prepared and just randomly asked questions. When I asked about the position it was clear it wasn't well defined