Mailshell Software Developer interview questions

After applying online on CareerBuilder, I received an email from someone at Mailshell saying that they had received my resume and would I like to start their interview process. This consisted of a .zip file with around a thousand emails in text form that needed (if I remember right), an email id and domain name extracted from them. This was not terribly tough and I finished it in 3-4 days. After that I received an email saying my solution was satisfactory and that the next step was an interview on an IM client (!?). This consisted mostly of HR questions and I thought I did well on them. 2-3 days after that I received an email saying that I had been selected for the next round, which was a phone interview with the VP and we scheduled a time. Around 5 min before the scheduled interview, I get a call from I guess his secretary or someone in HR who matter-of-factly tells me that the position has been filled. It takes me a second to understand what was going on and a further 5 more to calm myself down to the point where I'm able to stop myself from yelling abuse into the phone. She then tells me that I'm free to apply online again if I choose to and then hangs up on me. End of story.