Kendriya Vidyalaya Sangathan — unauthorised credit card charges

Hi sir, i have applied in kvs recruitment for udc post which have 750 rs application fee. So after filling application form for udc i have received an id-kvs1224270 for making payment for application fee rs 750. So for make payment of 750 rs i had used my credit card then after processing fee an amount of 763.50 had deducted from my account and kvs site shows an error payment status is failed then after this i send an email to kvshelpdesk.[protected]@gmail.com for this issue an requesting for solving this issue by either revert my amount or submit my form successfully but those not able to resolve my issue yet although i have send an hdfc bank confirmation mail against to payment deduction with transaction id and all related information so kindly resolve my issue and revert my amount of 763.50 to my credit card account.