Mars Senior Implementation Engineer interview questions

They contacted me back very quickly after the submission of the CV. I had interview with HR, person was really freindly and asked to have additional information by whatsapp, promised me to come back to me with an answer after 1 week. But she never contact me back, and position was sponsored again on Linkedin after 1 week. After 4 weeks I received the automatic replay from the sistem that i was not been selected. I asked to a feedback of my interview and never receive an answer. I had feeling that they ghosting me.