Octopus Energy Customer Service Representative (CSR) interview questions

I was given a phone interview and then a Skype interview followed by a maths and english test, I was given really positive feedback in the interview but it seems that this company never stop interviewing people. If you are lucky enough to get a space on a discovery day straight away then you don't get left in the lurch of "maybe someone will drop out" as they only take forward what they describe as the "strongest candidates". I've been waiting for about a month now for a space to open up on a discovery day, really feels like i've had my time wasted.