Byjus - Regarding Cancellation

I have taken a course for my son, on *nd jan ****, and their tab and study material delivered, and the their trial period begin on the day, this material were delivered. so we were not aware how to use tab they provide considering safety of product we did not allow our son to use it, as market person raju mehta suppose to provide demo, instead on **th he gave us number of mentor, and later we started enrolling my son for studying through tab, since we clarified during booking that his schedule is over occupied and it will be difficult for him to manage additional studies to raju mehta, and the same thing we witnessed in following days, as my son not able to do additional work, but unfortunately in family i was dealing with one medical emergency and missed to inform team byju's about cancellation, so i informed them on the *th feb ****, and requested them to accept cancellation, end number of calls i made to their few numbers where every time i got assurance decision maker will call me, but it never happens, meanwhile our mentor ankit kumar i request his call but he also not called, and now everyone is just fooling us that sr. person will call and clear the matter, but no one is taking responsibility,
in fact i requested them over call that ** days are your free cancellation if you wish you can deduct the one month payment and accept my cancellation but still nobody bother to reply properly, very very tricky things they are doing with the parents.
i request voxya team to please help me out to get rid of this thing.
everyday morning, afternoon and evening i am calling with them hope that some good person can speak and try to understand our position but so far i did not came across to such person from team byju's everyone saying we are gearing up your matter with senior person, but nothing moves.

please help