Airtel — not accepting to do reversal of the wrong recharge

I was trying to do a prepaid recharge to one of my friends number and mistakenly i put one number wrong. Tried reaching out airtel through all the medium possible to help me with the reversal but they are continuously rejecting providing the reason of third party recharge. I accept my mistake but the recharge value is 1700 rupees which is of a great value to me. Please take necessary steps to help me get he reversal.