PhonePe — amount debited from my account but still not sent to the receiver

Hello sir/madam

I am sandepagu sanjeeva kumar ac/no:[protected]
Saving bank account in sr nagar brach in hyderabad

I am here to inform you that i made a payment of rs 1100/- for the college exam fee of my brother on 2nd may 2020 around evening 4.30 pm using phonepe application.
I got the successful transaction and amount had been debited from my account but the amount was not sent to the college from your side and now the college manager is asking me to pay the few again.
Now it is clear that 1100/- rs had been debited from my bank account and not yet refunded to me even after 10 days after the failure transaction.
So i request to do the needful at the earliest.
Thanks and regards
Sandepagu sanjeeva kumar
Account number :[protected]
Branch: sr nagar, hyderabad
Account type:savings account