Sixt Senior Software Developer - IOS interview questions

First of all I got a phone call from HR representative without any date set before the call to do an HR phone interview, after that she back to me over a mail telling me that I've passed the first step and the next one will be coding challenge -They sent the challenge without deadline- I did it within a day it was very easy. After about 10 days I got a mail from a new HR representative telling me that "Your profile impressed us and we would like to have an initial Skype call with you." I told her that I am currently in the middle of the process with the company, is there something messed up or what!, she back to me telling that she is sorry she didn't mention that, this means I passed the task step and invited me to have a technical Skype interview with the mobile labs team leader. In this interview which should be 'technical' the interviewer hasn't asked me a single technical question!, after about 25 mins of talking about my experience and those HR staff which I was asked on the first phone call he came through my coding task and told me that it's perfect I can't ask you any question on it so let's move on the next step which is an invitation to visit the office in Munich, he told me that the HR will contact me within three working days. After about 10 days I got a rejection mail containing no feedback or reason for the rejection, I mailed both HR & the interviewer asking for reasons and feedback and no one replied me.