Byju's — Refund or compensate

The agent came from byjus to make order provided all the wrong information. He told us that we can cancel it anytime and he will initiate cancellation after 15 days if we are not satisfied. We asked him to cancel after before 15 days he said it can only be done after 15 days and after that he stopped picking up our phone. The classes are not working properly and i have to pay huge interest to the bank on EMI.