Central Board Of Secondary Education [CBSE] — Discontinued children's education

My name is shefeer my two child education now stuck conditions, school located Kerala kochi aluva, school name sri sai vidya vihar,
Prev year fee balance 9000/-, 2021 jan 2 call school management, but they tald me clear all dues after that new additions available.
September first week talking time they tell me no admission in this year,
Simple

My child 1 year spoiled,
How to react
My child what to do