Airtel — refunds of recharge failure

Address:

Mumbai City, Maharashtra, 232101

Sir,
On 30 aug 2019 and i made 3 (three) recharges of Rs 349/- each for my prepaid airtel number Data benefit through MyAirtel app using my Amazon pay through sbi net banking . However the transaction was Failed and i didnt get the Data benefit whereas my money was deducted from my mentioned SBI account. i have made several calls to Airtel help line and was assured that i ll get the refund but I am still not got the refunds.
I will be grateful if you would kindly look into the matter and refund the amount as early as possible. thankyou