Wells Fargo Customer Service Representative CSR interview questions

I was offered an interview by email, and I tried to accept, however it said that the interview times were full. What? I was at work and they track what I look at online, so I don't job hunt while at work. I could not believe it, I was offered an interview but it was too late too accept since other people accepted already? Why did they do that? Do you really want to work for a company that sees people as *that* disposable, where they make you compete for an interview slot that you were "chosen" for?