GoTo interview questions

You are given 48h to complete an "homework". I was told to make some assumptions if I had questions and that I could discuss them in the 3h interview booked after the test. I made some assumptions based on the unclear homework criteria. After the senior developer reviewed the work, the interview was cancelled 2h before the agreed appointment. Totally unprofessional and waste of time. I lost 2 vacations day for nothing, not even a chance to get some interview experience. After reviewing the "developer" comments, I'm glad I didn't get the job. The guy sounded like a total hassle to work with. On the other hand, the company recruiter was very friendly and really eased the process.