Shiksha.com — Unable to receive paytm 100rs reward on college review

Dear Sir/Ma'am,
My email ID is [protected]@niet.co.in. I reviewed my college, Noida Institute of Engineering and Technology on 21st March 2023 and I got an email from Siksha.com on 4th August that to claim my reward I need to follow the link given below in the email. But I am unable to claim the reward as the OTP which has to be sent to the mobile number to verify, is delayed every time I click on verify button. Like I click on the verify button, the otp received on my number is received after 30 minutes or 1 hr. And the problem is that the OTP is valid for 10 minutes. How do I claim the reward?

Thank you