On the phone and told me he will contact me in a different moment when he has sorted out his tech issues on computer but did not. So far it has been a week after and I still have not received that call he promise and I think it gets quite unprofessional when people do that and it dissapoints you

Difficult and can take sometimes 2 hours. Challenge, but good at the same time to gain experience. Depending on the position you applied for. Generic questions then slowly start getting difficult questions, to see how capable you are.