I recently completed a dna test as I have always been unsure as to weather I am the biological father of a 5yr old and my ex hasn't allowed me to see him for the last 3yrs the results came back and I am not the biological father however I have been paying csa straight from my wages for 5yrs I need to know how I stop this payment and also more impotantly if Im entitled to claim the money I have so far paid in maintenance back?

