Byjus — Education program- tablet for 9th standard student

I have taken tablet program from BYJUS and paid registration fees as Rs.5000/-, i l clearly told Byjus that this program is on trial basis, if i don't like it, will cancel it, they also agreed for 15 days trail, the Tablet was sent to us on 12th Feb 2021 within Five to Six days i understood this is not worth it, so i decided to cancel, i have called and informed Byjus about cancelation, sent a mail on 22nd Feb for cancelation, three or four persons called up, i told them why iam canceling, then their sr. Manger called and told that cancelation process will be processed after that, no one picks up the call, no call back, no reply for mail, now NACH mandate is due and i want to cancel for that as well, but there is no response from them