Syndicate Bank — transaction successful but amount not reached to merchant

Address:

#13,1st floor, near SBI ATM, 9th cross, vasanthnagar Bangalore, Bangalore, Karnataka, 560052

Hello sir my syndicate bank account no is [protected]. I did transaction on 8th january 2020, i had booked indian cylinder and payed amount of rs 717 through payzapp app, i payed through my rupay debit card which i have saved in payzapp app. The amount got debited immediately but after receiving my cylinder the delivery boy asked me pay the amount in cash because they dint received the amount. I contacted payzapp customer care they also told that it is better to contact my bank please kindly refund my amount
Thank you