Vistara — refund not received

Address:

Flat 1E, Sopan Appartment, 104, Saha Para, E M Bypass, Garia- Fartabaad, 700084

I had a trip with you on 18th oct'19, to new delhi from kolkata with flight no. Uk-708 (Mr. Sumit gupta, pnr - m25rnr). On basis of this flight i had to catch another international flight from delhi at 4:55 am (Gf 131- pnr k6hm28).
On my arrival in kolkata airport i came to know that vistara flight is delayed by 4 hours and in the counter nobody could assure me it won't delay further.
I had to rush to book another flight with air india (Scheduled at 20:30) and that moment i received no cooperation from anyone at vistara, rather i was shocked to see the rudeness of the people sitting at the desk (Specially i would like to mention about ms. Sweety). However, i was committed for 100% refund. They took my pnr and ask me to leave. As my flight was abt to taken of i had to leave.

My refund not taken place so far. Pl do needful