TTTECH Computertechnik Devops Engineer interview questions

Totally 3 rounds of interview: round1 : Hr and Technical Manager: Introduction about organization and team structures.Question more related to technical aspects and real time scenarios Second Round: Technical Manager and AD : Case Studies and problem faced in the current roles. third Round HR round: In HR discussion there is no much questions about behaviors. Usual questions like Notice Period, relocation, Date of Joining. I have accepted the offer but the process not yet started for almost 6 months there is no proper responses from HR team. I'm totally blank finally i forfeit the offer since there is no concrete joining date or process status