Byju's — Refund my money

Sir I have taken this course for my child . through Mr Aman Monga and I have pay 5000 through Paytm and rest 41900 through my credit card but after 7 days from taking this course my child is not satisfied than I call Mr Aman and say pls refund my money as soon as possible. He says ok with in 10-15 days money will be back but my first installment of credit card is also come and than i talk to Aman he is saying we will refund all from now no mentor and even Mr Aman is not picking up my phone.
So I request you to please take some necessary action in this matter and refund my money.
Thanks Manish