Punjab National Bank — Complaining about failed upi transaction - payment not received

Address:

Bangalore, Karnataka, 560082

Hi, i have made a upi transaction on the nations greatest bank punjab national bank. As routine their servers were down. During the transaction process a message prompted transaction failed and money has been debited from account. After contacting customer care on mobile they said our servers as busy (4 times in 4 weeks in a month) and finally said money is credited back on same day (Which is out of nowhere in my bank statement).
Funny part is when i registered a complaint at branch with a proof, they too were unsure why the app is and how it works. I may or may not get refund. Punjab national bank - 2nd largest indian bank (They say so) sucks