Byju's — Cancellation of subscription

I have taken three year course for my daughter (10, 11, 12) my child is not satisfied with their teaching as the content loaded in the tab is quite different from the syllabus of her school which we find difficult and confusing. She feels difficult to attend the class after school she feels burden to learn both.I would no longer require the service provided by byjus . We have already informed about the cancellation but Now they are not answering our phone calls and not responding to our request.they have already took my money for three months INR: 11001. Pls cancel and refund the money fastly.