Finomial Senior Engineering Manager interview questions

My worst interview experience ever!!! They took 6 rounds of interviews spanning two months. The interview pattern was strange: first 3 technical rounds where junior members interviewed. Then after one month of silence CEO and VP products rounds. And most strange of all - another technical round that again included the interviewer from the first round! And then they found me unfit! Summed up interview time was 5 and half hours. I guess they were just playing around with me while searching for a cheaper candidate. Totally unethical and unprofessional. Now I feel good that I don't have to join this company