Very bad experience. Poor Management and no coordi...

Very bad experience. Poor Management and no coordination at all. They had shortlisted my profile and scheduled interview with their client IMS Health recently. Before and on the day of interview, they called me so many times to make sure I reach the venue on time. I spent my entire day attending all the interview rounds and I was selected. After that, HR discussion also happened and also asked me what all questions I was asked. They said they will revert max in 2 days. Now its 3 weeks+, I have not got further update from them re. offer letter. It seems that I have wasted my 2 days as well as cab money by going for the interview with the company that has such a poor management.