2.8k deducted from my account, bank and I cannot trace it

FOUND NO SUBREDDIT TO POST IT SO POSTING IT HERE
I have account in Central Bank of India, last month randomly I received SMS of debit of amount Rs 2897 I went in the bank app and I saw that some UPI transaction was made of I checked my UPI platforms that I use (gpay and phonepay) no transaction or autopay was deducted ( I have no autopay). So I went to bank to know that can they tell where in which account or company my money went they said straight away that they cannot tell that as in that UPI is written contact gpay and phonepe if they can help, so I contacted them and they said that no transaction was made that day of that amount then I myself decoded some odd things in that transaction. Sharing transaction pattern rest of the transaction have this pattern
date/chq/ref no. / UPI/RRN/some number/UPI account holder name
now sharing my 2.8k transaction pattern
date/chq/ref no./UPI/RET/somenumber/31102025/ my account number DOM
at last DOM was written
firstly in every transaction (credit or debit) after reference number RRN is written but in this RET was written then after that UPI account holder names comes but in this case firstly 31102025 is written which I thought indicates 31st Oct 2025 not sure about this and then my account number is written that thing which is not in the case for other transaction.
Can anyone can help what's the case and why is this so?