Byjus — Cancellation and refund to the course applied JEE MAINS

I want to cancel my course and want my refund from BYJU'S. When I mail them and contacted them via their customer helpline number but they are just they'll contact me within 24 to 48 hours but it's more than two weeks since they didn't contact me yet. I haven't received any call from them. One of their employees told us they will cancel the course and let us know within 24 hrs that has been completed 3 days ago As per their policy EMI auto-debit process is going be start on 7 April 2022 through my account. And I want to cancel that course. And when I tried to call them and contact them there is no response from them. Please help me with this as soon as possible. There is no response from the customer service of BYJU'S when we tried to contact them and I have a 27, 000 down payment for the course.