Zendesk Sales Operations Analyst interview questions

I received a message from the hiring manager (28th January 2020) as he asked me to let him know my availability for a first call interview. I gave him full availability for the next 2 weeks... He didn't reply to me for the next 4 days so I texted him again for a follow-up. The day next he apologizes with me and asked me again for my availability... the next working day I gave him my availability again, and again he disappeared for the next 4 days... so another follow up message from my side; no reply! The day next I received an email from the HR saing that I have been rejected! So summarizing: first I have been called for an interview then ignored for 2 weeks and then rejected for absolutely no reason (I didn't even get the chance to have the first interview)! Worst interview process experience I have ever had in the last 15 years of working experience through several multinational companies! Conclusion: I still think that Zendesk could be a great place where to work, however, I really would suggest the management to pay much more attention when they hire "managers" as they reflect the professionality and credibility of the company... and if this is the professionality and respect that they have for candidates, then it is not definitely a place where I would like to spend my time!