Jio mart - Refund not received

I am a serving Officer in Indian Airforce and Jio mart is troubling those who serve the Nation.
I ordered iphone** from Reliance Jio Mart on ** Oct ** ORDER No. *****************A using HDFC debit card on installments basis. The order was cancelled from the mart itself on ** Oct ** mentioning no reason and on refund status it was shown that money will be refunded within *-** working days. This *-** working days got over on ** Nov ** but i didn’t receive any refund. On ** Nov ** I again called the Jio mart customer care and lodged a new complaint with complaint no. ********** and was told to wait for ** hours. Also on ** Nov **, first installment of ₹**** was deducted from my bank account. Thereafter I was given same answe to call back after every ** hours and till date i.e. ** Nov ** I have made several calls and my issue has not been resolved and every time I receive the same answer.
This behaviour of such a reputed company with its customers is really worrisome and creates trouble and harasses the customer mentally and financially.
Kindly look into the matter and provide me with solution.
My contact number is **********.