Possible fraud connected to CSA calls

I received a call from a man last night informing me that two payments had not been made to my child’s mother for December or January.

He asked me to make an immediate card payment to correct the situation, which I declined. I told him that the collection of payments was under the responsibility of the CSA and would check my bank account.

All of my payments have been collected promptly from my account, this either means that teh caller was a fraud or that the CSA has made an error.

Why had this person called me without first checking that collections had been made?