PiF Technologies Software Support Engineer interview questions

They emailed me immediately after applying, telling they like my resume a lot and if I needed future sponsorship. When I replied that I would need one in the future they stopped communicating with me with no answer for three days. I had to call them next week if they received my email and they said yes, and also said that the position is already filled out. First of all, why show interest in me when they were hiring some person in less than 3 days? Second, the position was still on the portal for a very long time which means that they were lying about that the position was already filled out. Now if the company does not hire international students, why put on a portal where international students have access to? Above all, why can't they simply say on their job description that they do not sponsor? In addition, I am on OPT. I do not even need for a TEMP position. The person in charge was Brent Wezler.