Call the cops!
While it is not rare for interviewers to switch up the position they are interviewing for, going from an IT position to a cold-calling sales job is a bit of a stretch. In that situation, do not be shy to ask for clarification.
Something that is definitely not okay is for the office to call the police on someone for giving off their misleading job posting! Besides, it is not like the interviewee was blasting Peter Gabriel outside of the office like Lloyd Dobler on Say Anything...