Billdesk — money deducted but transaction not done

Address: Alappuzha, Kerala, 690101

Sir/mam
I have done a payment via billdkstatebankcolle for
All india institute of medical sciences post-graduation (Mdms) examination
An amount of rs 1, 517.70
(Narrationnhdf[protected]/billdkstatebankcolle)
On 05 oct 2018, the above amount has been deducted from my account but the transaction was not done.
My bank is hdfc.
Kindly do the needful.
Thanking you.