IDP IELTS — Amount debited but slot isn't booked yet

I've completed my IELTS application and paid the transaction amount of 1400/- on 5th May 2021 but there was an error 404 message generated furthermore, there was no confirmation if my slot is reserved.
I would request you to communicate the details as early as possible because I need to plan my test accordingly.
I hope to hear from you soon!

Thank You!