Byju's — Not refund/stop my subscription

Respected Sir,
With due respect I beg to state that I had taken Byjus subscription at Rs.5000 on 17-04-22 and the educational supporting materials reached my home through courier on 25-04-22. As per the terms and conditions I write a mail to [protected]@byjus.com that i want to cancel my subscription and refund due to my child don't like it. But they call me and asked to reduce the charges but i said my child don't like it. They said we will send you a mail then after your confirmation we will go for it. But on 01-06-22 a massage got by me that i have to pay rs1583 emi on 07-06-22 without my acknowledgement and call back regarding this. In the same date a executive call me that my previous emi Rs4942 is converted to rs1583. I said her to mail me what you talk to me several time but she said we can't mail you.
In 01-06-22 i again mail byjus that please reply my previous queries which is not understand by me.
And today while received a massage that my previous emi is not cancelled, and i have to pay rs4942 i am very much sad and harassed.
Therefore I would request you to pease help me fir refund my Rs5000 and stop my subscription from byjus.

Thanks and regards
Babashri Lingaraj Prasad Gumansingh
Byju register no.[protected]