K3 Business Technology Group Sales Development Representative interview questions

totally unprofessional because I got for the first interview an email with the wrong interviewer after that another e-mail with the right person, after successful 1st interview I was invited to the final Round. On the invitation it said cleary that the interview would be with Tony Bryant but at the interview was a German Team member of K3 - here I was prepared for a different interview. Maybe companies want test candidates for surprises but its quite unprofessional to be prepared for a Englisch interview with Mr Bryant and then Karsten Kurella is there at the interview