Shoo-In interview questions

I applied online then received phone interview and on-site interview invitation really quick. The first 10 minutes of on-site interview was okay, then the interviewer suddenly ask if I'm interested in a Sales(Client management) position that I did not apply. When I asked about the originally position I applied, I was told that the position was fulfilled in 2 days ago. Clearly the company doesn't have the common sense to notify candidates not coming in to interview with a position no longer existed. Also from the interviewer's reaction, I feel the fancy marketing position was only created to trick people to come in for interview, so that the company will stand a chance to talk people into the Sales position that starts with low-paid internship. The whole experience was a time-wasted scam.