WhatsApp Verification Code Not Received on Oppo F31 Pro 5G

I have been unable to receive the WhatsApp verification code on my phone number +91 81227 21*** for the last three to four days, despite repeatedly trying to verify my account. The code never arrives and I cannot complete the verification process, so I am unable to use WhatsApp on my Oppo F31 Pro 5G device. During this period I have already tried basic solutions such as resetting my phone and reinstalling the WhatsApp application, but the situation has not changed and I still do not receive either SMS or the verification needed to log in. I request that this issue be checked and resolved urgently so that my number can be verified and my WhatsApp account can be activated again as soon as possible.