Byju's — Byjus subscription cancellation

My self Avneet Kumar f/o Abhinav Gupta.Abhinav, s register mobile number is [protected] and alternate mobile number is [protected].We are not satisfied with Byjus classes timing.We want cancel Abhinav's subscription.please cancel the application and refund the amount fastly in payment mode.we have returned Byjus tab and books kit.I have try to reach customer care by your cancellation helpline number but not reaching near him.please cancele this.