Power Integrations Power Electronics Systems Engineer interview questions

Long wait after applying from the main website, I contacted by email to fill two long forms, I waited again for another month. They contact me for an interview and to fill another form. After getting in touch with few recruiters to set up a meeting time. They stopped responding and send me a refusal a week after without any reason. Waste of time and not professional. I wouldn’t be happy with such a crap company