ASDA Online Services Colleague interview questions

Got an interview over a month after applying for the job. It was in person (which I thought was odd considering the circumstances), with one person. It was basically just me signing documents and questions about availability. It was a very weird interview as no typical interview questions were asked. After 10 minutes I was told to expect a call from them within a week letting me know the outcome of my interview, despite having not been asked any interview style questions. My interviewer also had a mobile phone call mid-interview.