BBC Post-Graduate Data Science Apprenticeship interview questions

I applied in April. Around 6 weeks later I was asked to do a video interview and a 4-8 hour coding test. I passed these and was then told to book onto a Zoom face-to-face interview. Basically my interview did not happen because the HR recruiter did not send me a Zoom link to join the meeting. So my interviewers got a bad first impression of me by no fault of my own. I was thoroughly disappointed and chased HR up. I was ignored for a week, until I finally received a response that HR would try to help to organise another. Almost 2 weeks later, I was given another interview time, for Wednesday the following week. I was elated and prepped... Unfortunately, the week before this second interview they sent me another email that I missed - requesting to change the date again. I emailed requesting another attempt but have been ignored. I feel it is a bit poor taste for HR to ignore me. Especially considering the hours I've now effectively wasted writing code, and prepping for the interviews.