Airtel — wrong amount recharge and they are not refunding...they are disconnecting the call by saying they cant help

Address:

110053

Sir i was trying to do a recharge of 1 year on my number but by mistake i did a recharge of 1000 rs... They are not reverting my transaction neither i can transfer that amount... I can only recharge selected plans with that number...plz help sir
[protected] plz help me to get a refund .
.. i contacted the 121 (airtel care) they are talking like it is my fault and they are not related ...i know it is my fault but i am a customer from 2007 and this is my first mistake ...but they are saying they cant help like it is inevitable and impossible. Please help me to get a refund