Byju's — non refund of amount on cancellation of trial subscription

I was contacted by byju free lancing agent. He was regularly contacting me and following up for appointment. Once i agreed for trial subscription and paid rs.9000/- my son felt that it not required as of now and trial kit may be returned for refund. My request no is 3030153. I have been following up for the last 3 weeks but there is no action from byju. His local representative is also not responding on cell. I feel cheated by byju.