Airtel — wrongly recharge of 55 rs

Address:

Bhilwara, Rajasthan, 311001

Dear Sir,

please note that i already using 398 pack with unlimited calling. i just checking offer on phone pe and suddenly maid a recharge of 55 rs and got 55 rs balance.
tell me how to use this recharge amount.

i call customer care and talk to executive nitin ji to roll back this recharge and transfer money to my main account of airtel but he told me that it is not possible

my reference no. for request was CBNRV[protected]