So I managed to get a job interview with this company that sells and rents Uni textbooks. I had it last Thursday and they said they'd get back to me by the following day. They didn't, so I sent them an e-mail asking for an update on Saturday. Now, they still haven't replied and I'm not sure if thats a good or a bad thing (probably a bad thing) and was wondering if it's bad etiquette to just ring them up and ask?