Spectrum interview questions

Initial communication was a phone call from HR, then a 30 minute phone screen, followed by an interview with the hiring manager which lasted about an hour. Was asked to come in for face to face interview after, and provided availability over the next few days/weeks. Since then I have not heard from the company in over 2 weeks. This was the least professional interview process I have ever gone through and would not accept a job here if offered. Have sent multiple follow up emails requesting feedback and have not received a single response.