State Bank Of India [SBI] — 3 months old Failed transaction is not refunded yet

Sir,
I did a recharge of Rs.250/= to SBI Fastag thru sbi payment gateway with my SBI Debit Card on 13-Nov-2020. The transaction got failed. But the amount is not refunded yet. I have sent many mails to sbi fastag(attached the mail list). But no reply from them and the amount is also not credited back to bank or to the fastag. I raised the query to bank and they said that merchant has received the amount and they told that you need to contact fastag.

Please help me to get my amount.

Thanks,
Andrew