ZipEdTech E-Learning Writer/Editor interview questions

I had a two person panel at first, and then a third with who they told me was their boss. I was then asked to come for another interview a few days later, with the head of HR. All four people said that they really liked me. They had told me I was in good shape to be hired. I then waited for another week before being EMAILED that they decided to go another way, this was after I had emailed them to follow up on the status. They wasted my time and resources to get there and I was very upset to not get the offer especially after they had told me I was a shoo-in.