AbbVie interview questions

I had great interview with the team and HR. My whole interview process was completed wtihin 2 weeks. They told me that they will have a decision in one week. After 2.5 weeks, I followed up and they replied saying they will have an update within few days. After another 2 weeks, I followed up again and they said they will have an update by the end of that week. Now it is 3 months and no response from them. The system is showing my application now as no longer under consideration. As a professional who delivers by promised date, this is very unprofessional in my opinion. I feel like they could have at least told me that they decided to move on with another candidate since I am one of the candidates who followed up multiple times in the 3 months of waiting time. They have no respect for the candidate's time and they do not keep their word. It reflects very bad on their culture.