Byju's — no response from byju's (regarding cancellation) after repeated calls

I have enrolled for bjyu's tablet ias programme, paid consecutive first 3 instalments, but later due to unavoidable circumstances, i wanted to cancel the programme.

Regarding this, i tried to reach byju's many times, regardless with no positive response or revert from their end. The only assurance i used to get is "the executive will call you and solve your issue in 4 hours."