So sorry this is happening. This still sounds like it might be new-job growing pains to me and you might need to just ride it out. Also you mentioned your boss is leaving? So maybe wait to see what the new guy is like.

That's very weird about your boss not saying any of those things during your phone call but typing them up afterwards. It sounds like maybe a particular person or manager told her to tell you these things, but she didn't feel comfortable as her own perception of you is positive. It's very easy to ruffle people's feathers at a new job but I hope it will die down.

It can't be easy, but perhaps you could hang in there. You were so happy about the job a week ago and maybe this new stuff is transitory?

However, I don't see the harm in asking the agency if they have something else, just so you know if there are alternatives out there. But I assume contract work might not pay well.