Getting Call Recordings

I am trying to use https://dialpad.com/api/v2/stats to get a list of all of the recordings so I can load them into our legacy QA tools while we work on getting everything migrated to dialpad. However, I don't seem to actually be getting all of the calls. Instead of returning new results each time, it seems to be caching a previous call, and just returning the same results.

My query is:

{"timezone":"UTC","export_type":"records","stat_type":"recordings","is_today":true}

Even if it wasn't returning old data, it also seems to be missing calls from certain people. I can see the calls in Call History in dialpad, but they don't appear to be in the returned CSV.