Hindustan Petroleum Corporation [HPCL] — regarding payment issue

Address:

Belgaum, Karnataka

HPGas BkngNo 541873 Con 608981 Bkng Clrd 03.Sep.2019 SWASTIK TRADERS OTP 5065 http://ezpay.hpcl.co.in//ezypay//h//[protected] to pay for refill

HPGas BookingNo 541873 CashMemo 1312547 Dt 10.09.19 Rs.594.50, is generated.EZYGAS Authentication Code is 5065, plz share it to Dboy upon delivery

I paid the amount rs.594.50 via the above link and got the successful transaction message. But when the gas delivery came the distributor denied for the online payment received confirmation. However, the amount is deducted from the bank. Please help me in refunding it. If this is the case i will never dare to do online payments.