Deutsche Telekom interview questions

I’m waited in the selected time via Teams,but nobody came to the interview.I just left them,and i dont want to work with them anymore. Before the meeting the women was very friendly and helpful.I red a lot of negative about the company.

Sent all documents and contacted within the same day. First meet: no one of Deutsche Telekom joined the call Second meet: Teams call with a snr mngr ok, just discussed about my resume Third meet: should have been in presence there so I even searched for cheap flight to reach Bonn. But, after a couple of days that they told me to go there, they said that having a Teams would have been even better. I met with 2 people, mngr/snr mngr from tech and HR, who asked some question and required to ask in German (even if not my language). Ok, go for that. After that, gave me a case study related to M&A and Financial Data (EBITD, Revenues).. but, how are these topics related to the expertise of the interviewers?!?!?!?! Actually, they work for tech and HR damn.... by the way, they read a power point with the solution, it is not a case rather a homework for which they have been expecting a correct answer... 15 mins prep + 15 mins explain..