Walmart Pharmacy Assistant interview questions

I had one of the most unprofessional and unpleasant interview experience of my whole professional life. I was called for an interview for a Pharmacy Assistant position at 675 upper James Street, Hamilton Ontario, Canada. I travelled 3 hours one way (i was ready to relocate if selected) and when i reached Walmart. I was informed that this position has already been filled. Walmart could have informed me earlier. This is so very unprofessional. When you call someone for an interview, you don't decide before interviewing everyone else. Its the basic rule of recruiting. Anyways, i hope that i never ever have to apply for any position at Walmart Canada again. This was the epitome of unprofessionalism