Hi, thank you for your question. As there is a CSA application in place, the CSA has jurisdiction to deal with the maintenance and the courts will not accept an application to collect arrears. You should contact the CSA to inform them of these arrangements and they will carry out an investigation.
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I see - I think you have been wrongly advised by them. If there have been no previous court orders or CSA calculations for maintenance prior to Jan 2015, then there is no enforcement available against him.