Jntua — Registration failed but Money not refunded still now.( completion of 15 working days also)

My name is Gaddam Bhavani iam payed money for nptl EIA assignment in Feb 16 th 12:37pm, that time registration failed &send this message
Hello Gaddam Bhavani,
Your payment for the following course(s) has failed. If any money has been deducted, it will be automatically refunded in 5-7 working days.

Course Amount
Environmental Impact Assessment ₹ 1000

Here are your transaction details:
Transaction ID cb1f57cdc0a34e8d8b73f6d435d092cb
Billdesk Reference None
Date 16/02/2023 12:27:37 IST
Total Amount ₹ 1000
After that I am payed money again that time 7:26pm with another account registration successful but first payed money not send still now &send message after 15 days refund your money what's going on... My friends all get refunded money with in 5days.what is the reason for this...
Hello Gaddam Bhavani,
Your payment for the following course(s) is successful.

Course Amount
Environmental Impact Assessment ₹ 1000

Here are your transaction details:
Transaction ID 3728d6a8189044d1a770bc62e7640800
Billdesk Reference YHD[protected]
Date 16/02/2023 19:26:20 IST
Total Amount
₹ 1000