PIP UNANNOUNCED PHONE CALL

Hello everyone
I have been on PIP for some time now and I had to fill out a form December 2022 for it renewing .9 months later I have still had no decision or any letter to say If I need an assessment or if my award is staying the same or anything . I have received a couple of texts over the months to update me that they still have my form and are still looking at it
Today I have had a call from a withheld number (I never answer these ) and they left a voicemail to say they were calling from DWP about my PIP form and she will try call me again tomorrow. Completely unannounced.
Has anyone had this before ? Is this going to be a full telephone assessment or something else ? Nervous now as to why they would ring randomly.
Any replies would be really appreciated thank you

My wife has just applied for PIP and we had a call from a withheld number last Thursday but they never left a voicemail or phoned back. We found this unusual and we're expecting a brown envelope any day now asking for further information about her condition.

Thanks for your reply Chris
Two years wow that’s crazy! Yeah hopefully it will be just to confirm some details with it being so long since I did the form , that would make sense .
Thanks Chris

It’s very strange . I didn’t think they did anything over the phone I thought every thing was just all by post .
Thanks for your reply