Revolut interview questions

I applied for a Product Owner position at Revolut. After successfully having made it through the phone interview round, I was invited for a face to face interview with the founder. The interview was rescheduled three times by the company, with each time being on the day of the interview, with no prior notice. I thought this was unprofessional but I decided to give the company the benefit of the doubt. On the fourth occasion, when it seemed like the interview would finally happen, I arrived early at their office in Canary Wharf in London dressed in a suit and tie. Reception called the company and I was told to wait downstairs for someone to come down a called me. After 20 minutes of waiting I spoke to reception again and was told that they couldn’t get through to my interviewer. I have attended many interviews in various countries during my career and have never been treated this way. It’s completely disrespectful and unprofessional. I would not want to work for a company who disrespects their candidates in such a way.