ICD-Institute for Career Development interview questions

There was one interview with the hiring manager and CEO in the same day and then I was offered a position other than what I applied for within the span of three days. It was an easy interview as the organization was looking to hire someone quickly but it got weird after I declined the position and the hiring manager was still calling me for reasons unknown. This was after I had told them I had taken another opportunity and they acknowledged that. Instead of moving on to the next candidate, the organization seemed determined to get me to accept a job that I had already declined. It appeared strangely aggressive and unprofessional. Would not recommend working here.