Think Higher interview questions

My review appears too sharp but this is the fact; I attended interview with this company and never found any organisation so unprofessional and unethical. They scheduled for an interview first time with their founder and cancelled it after I reached the location. No prior notice. Second time, founder was supposed to take interview but the co-founder engaged with me for a quick chat (which they could have done after cancelling the first interview). They informed that they would schedule the interview again. Worst thing to mention is they wanted me to work for one hour extra outside standard business hours and training duration is unpaid.