Oh god I’m having the same issue with child matainence at the moment. My sons dad has been back in employment since may this year and i still have not received a single penny towards our son. They know who his employer is and how much he gets per week but are basically powerless because they said HMRC are not providing the correct information. I give up with them they are an actual joke. They say use collect and pay if an agreement can’t be made but they don’t even do this either.