I have being paying child maintenance by direct pay of £450 a month. Big child is 20 years in June 2019. Have no contact with mother or child. Called up CMS early April 2019 and inquired if big child was still currently legally eligible for child payments as did not think child would be doing A levels at 19 years old. Was meant to make payment early April 2019 and withheld until CMS got back to me. CMS called me yesterday and demanded payment as mother has not received April payment. I inquired if big child was eligible for payment – seems nothing was done by CMS about by previous call. Anyway CMS called mother and inquired what big child was doing at the moment. Mother told big child has been going to university since 2017. Therefore I have overpaid over 8K in child maintenance. Question is what are my chances of getting this money back? has anyone been successful in claiming back money. As I state I have zero contact with child or mother.