BSNL — Suspicious calls from consumer complaints

Website:

www.consumercomplaints.in

After raising a complaint in this forum, I received a call from +91 [protected] asking me to initiate refund via any UPI App. I obliged and started following the steps.
They had initially asked me to select pay option to [protected]@okicici and told me to enter the voucher code in the amount column (which is 24999); After which, i was asked to write the code AZREFUND in the comments and select pay - then give the UPI PIN.

The person was assuring me that after giving the UPI PIN, I would get an option to select pay / ask for refund. This looks very suspicious as this is similar to the process of transferring out money to someone. I had asked the caller to send out a formal mail to me highlighting the steps but I have not got any so far.