Airtel — don't refund after frequently complaining about high amount recharge by mistake

I had recharched in my airtel sim rs997 but i wanted to recharge rs99 on 6/04/18. As i had done a mistake so i complaint in airtel customer service. There they asked me to
Forward a mail at appellate. [protected]@in. Surreal.com.
So i did that but i don't get any reply still now. Thenafter i have called so many times in customer service. Eachtime they
Said that they can't help me. So i want your help to get back my money because on
Rs 997 there was nothing such special offer and it was just a roaming pack just for 1 day only and i couldn't use it so my money was totall wasted.