Dear Aspirant,

It happens sometimes due to some website issues. You should try another mode of payment option if there is one available or you should just reach out to the authorities. There must be some helpline numbers and email IDs.
I am providing you a link to their official website's help page. There are some numbers mentioned you should try calling.
https://www.comedk.org/contact-us/

Hope this Helps!
Good Luck

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