SSE Distribution Engineering Graduate Programmer 2020 interview questions

Applied online for the distribution graduate scheme, completed video interview and was offered a place at an assessment centre in Thatcham on the 27th November 2019. On the 24th November 2019 I was called by the recruitment team to cancel the assessment centre as they did not have enough candidates, which would make the group task infeasible. I was reassured that another date will be agreed for mid to late January 2020. I then received an email at the end of January saying: "Thank you for applying to join the SSE Graduate Programme. We regret to advise you that a decision has been taken by the business not to progress with the recruitment of this post and the vacancy has now been cancelled. We apologise for any disappointment this may cause and want to thank you for the time and effort you put into the recruitment process. We hope that you will apply to SSE in the future. Any new opportunities will be posted on our careers site (www.sse.com/careers)." Firstly, how can a large company like SSE not have enough candidates? I know many people who applied the same time as me and were not offered a place at the assessment centre. Secondly, a graduate scheme is done year after year thus, how hard can it be to arrange the same thing at the same time every year? To top it off, they have apparently cancelled the vacancy as a whole which leaves me to believe they are some sort of sick joke.