Zomato — Food order rejected but refund not provided by Zomato

I had ordered food through Zomato. But the restaurant rejected my order due to peak hours. Zomato sent me an email stating the order could not be fulfilled and refund of Rs.1, 671 is completed, and if I didn't receive it in my bank account, please contact the bank. I did not receive the refund till now and hence contacted my bank. My bank asked me for the refund UPI transaction ID. Unless I give the transaction ID they cannot trace the refund and help me. I contacted Zomato customer care multiple times, and all the time they said they do not have the transaction reference ID. Looks like this is a fraud play by Zomato. As per RBI regulation, every financial transaction should have a transaction reference ID. Anyone has a suggestion how I can proceed with this Catch-22 situation? We should expose this fraud play of Zomato to the relevant authorities.