Byjus — Amount not refunded

I paid rs 10000 to byjus for ukg to 3 class as advance amount but due to some condition i am unable to pay more. I have already told the same to byjus. At the time of admission they assure me on case i want refund they refund me the amount but it has been already 15 days i regularly send them mail for refund but not getting the same.