Hays Recruiter/Consultant interview questions

Only managed to get a phone call interview where they asked for your motivations to join. 2nd round interview was supposed to be an assessment centre and seemed to have been pre-arranged prior to my call with them as there was a fixed date aready. Informed them that I couldn't make it due to prior plans already and said that they will get to me on the updated date. It's been 2 weeks and no indications of rescheduling.