WiderNet Project interview questions

Had two phone interviews with staff and one in-person interview with the director, all of which seemed to go quite well. I was told I could expect to hear something from them within the week, as the director was anxious to hire new staff. I followed up with the company representative three separate times, the third occurring a full month after my in-person interview with the director. Each time I was told I was still being considered for the position and was a strong candidate and that they considered my persistence a positive sign; three months later, I have accepted an offer from another organization, but still have received no official rejection or further communication from this company. I am very disappointed by such unprofessional conduct from an organization whose mission and values I and the rest of society should hold in high regard.