mystery phonecall

Hi, I was just looking for a wee bit of advice please, I received a phonecall yest from a 'withheld' number. They first asked for me, then said sorry they were actually looking for and said the name of my support worker. Before I could ask what it was about as that is my support worker and myself they asked for, they said sorry wrong number and hung up.

So the thing is I had my WCA around this time last year and my support worker came with me. I have had calls from DWP before usually from 'withheld' numbers, but my question is do they call support workers for an update or more info before a re-assessment? I am on UC and I haven't had any messages about a re-assessment. I am now very nervous and wondering what's happening, I was also due for a PIP review back in Nov but didn't hear anything then either, I am way too scared to 'rock the boat' and call and ask them what's going on lol.

Any advice would be greatly appreciated, thanks