Esa to uc migration and request for further evidence appointment

Hi,

I've just done my managed migration from esa (support group) to uc. I had my telephone appointment to verify identity and during this I confirmed with them that I am studying 1 day a week part time at college. I then was asked to prvodie evidence of this in my journal. I provided this evidence and now they are asking me to come and attend in perosn to provide the same documents I've already uploaded, as part of a "further evidence appointment". Ive questioned why this is necessary as I've already provided what they've asked for, but I'm not sure where I stand on having to attend in person? Can I not do this over the phone like I did the id checks? I'm just scared they are trying to find a reason to challenge my benefit entitlement.