BT Group Customer Service Advisor interview questions

Terrible, long-winded experience for an entry-level Customer Service advisor role in Cardiff. I have worked in call centres before, I have worked in customer service for over 10 years and, like many people, have been out of work due to Covid-19. I applied to BT and did their online assessment. So far, fairly straight-forward. I then had a phone interview which was cancelled by the interviewer minutes before it was due to take place. I was patient and re-scheduled (these things happen). I had a phone interview that lasted one hour and was standard-'Why BT? Why should we pick you? Tell us a time you received good customer service?'Etc. I was told I had passed and would get a second phone interview. I waited weeks before finally getting a call to schedule this. Second interview was ANOTHER one hour phone interview of similar questions. I was told I would hear back within 3 working days....several WEEKS later, got an email saying I was unsuccessful. For a company that prides itself on communication, they were utterly appalling. I asked for feedback, interested to know where I'd failed and never heard back. Due to Covid-19, jobs such as this have been elevated to astronaut-like selection process and what frustrates me is the time taken overall. It was a few MONTHS from initial application, online assessment, two phone interviews at an hour each and finally getting notified that I hadn't made it (for reasons unknown). Am I bitter about it? Just a bit! My advice if anyone is thinking of applying; make sure you answer every question using their STAR method (google it) because they grade you entirely on this.