I have just come across this site and thread,
I also had this happen to myself and my wife, I am in my 70's and had HCEO's arrived to claim money from my son who does not live with us.
The company was also Court Enforcement Services Limited.
Managed to get £4308.11 out of us.
I sent a very lengthy complaint to them,
After a month they replied with a fairly short very dismissive reply to all my points,
this followed several letters going back and