Tesco Dotcom Assistant interview questions

Had a one to one interview. Another interview took place at same time. Managers took notes and discussed it invited back for more questions and later offered the job. The overall process was approximately a hour. After invited back had a kind of group interview - induction where answers were told. Think it was training

I initially applied online for a few positions at my local Tesco. I got called in for the interview and everything went great. They said id hear back from them in 2 weeks however 3/4 weeks later i got a call saying that i needed to go in and hand in my NI number plus passport (again) as there was a failure in their system. When i got there there were 2 others with me and we were told that we'd got the job. After that day i never heard from them again despite me calling several times.