Just did mine, this answer is for people doing the retail advisor role:
They firstly asked, Why Vodafone?
Then asked, Have you ever had an experience with an upset customer, and how did you deal with it?
Have you ever had to meet a target, and what target was it, how did you meet it?
They asked something to do with academics but i’ve completely forgotten what it was, something to do with college or uni. If you’ve got any more questions just reply here