Reliance Jio Infocomm — jio phone cancellation

Address: Thane, Maharashtra, 401202

I had done pre-booking of jio phone with my number [protected] by paying rs 500 via credit card. I am not satisfied with the terms and conditions, as minimum rs 1500 needs to be recharged in a year, i tried to call on jio customer care but no positive response received from them, i even send email to [protected]@jio.com appellate. [protected]@jio.com appellate. [protected]@jio.com
But i received the response from jio care mentioning that i cannot cancel the order.
Kindly assist me to get my refund back