Meso Scale Diagnostics Inside Sales interview questions

I had a phone screen with HR. After preparing for an interview one day, I got a call less than 10 minutes before asking to reschedule to the next week. We agreed on a day and time. The day before, he canceled again and asked to reschedule for Friday (several days away). To say the least I was annoyed. I withdrew my candidacy. I refuse to be treated so poorly. I may be the candidate, but I don't want to work with someone who clearly doesn't care about me from the very start.