State Bank Of India [SBI] — Recharge amount not credited to SBI fastag

I recharged my fastag on 6th march account to sbi fastag recharge of amount of 250/- and no transaction got credited to the Fastag account whereas HDFC BANK has given the UTR no. for the same transaction with the message of transaction Successful.
I want the refund of the debited amount which has got not credited to fastag account.
I called Customer care and got to know there is no transaction happened on 6th March. If transaction fail then refund has to be initiated.
I send lot of mails to helpdesk.[protected]@sbi.co.in, but did not get any response.
Please help me to get refund on fail transaction.
follow up mail and fastag statement attached as proof.