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As it appears you have no idea why they have not terminated the child support your first step should be to write to the CSA, enclosing a birth certificate of the child and requesting an explanation as to why child support should not now be terminated.
Normally child support ends when the child turns 18 years of age, however if the child is still at school (including TAFE or similar secondary education), the support can be extended, upon an application by the child support recipient, till the end of the school year.
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