Citizen — refund my online payment

Address:	I.gopal 1/122 East Thiruvalluvar street. Ammanpuram. Thiruchendur taluk. Thoothukudi- dist.Tamilnadu., 628201
Website:	ezpay.hpcl.co.in//ezpay//h//9110877600009044

Hpgas bkng no-507605 con 601836 bkng clrd 13 may 2019 shree guru hp ga. Otp 9909 http://expat.hpcl.co.in//ezpay//h//[protected] to pay for refill.
I paid the amount rs-780.56 via above link on 16.05.2019.7.03am. Transaction id-[protected] 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