Scotiabank Project Manager interview questions

My first interview was with Human resources, they called me for a screening process, I passed and then I had an interview with two senior managers, I passed and I have an interview with the Director. After that I was told I was selected. However, they called one week after saying they closed the position that they won't offer me anything... My worst experience so far... I though this company was serious but I learned nothing is 100% concrete until you get the offer letter, lesson learned I should be careful where I applied and in what I waste my time and energy.