Siren Care interview questions

After the digital correspondence I had a phone screening, followed by meeting the CEO and COO, and then their current contracted designer. I thought I was perfect for the role then wasn't contacted for over a month, I kept up with weekly follow up emails. After no contact I was sent an email saying they would love me to join.. I haven't heard from them since. Highly unprofessional, what I don't think they realize is that everything they do at this stage is setting a tone for their company culture, and that behaving like this is contagious. Quite disappointing because their tech is actually really cool and full of potential, and I was super excited to work with them to take it to the next stages.