WhatsApp Verification Fails for Nigerian Number and Blocks Account Access

I have been unable to access my WhatsApp account linked to the Nigerian phone number 090468856** for about two to three months because I cannot complete the verification process. Each time I try to log in, the verification fails, and I am not able to get into my account. Even as of today, I still cannot verify the number. I have already tried to solve the problem on my own, but despite my efforts, I still cannot verify the number and regain access. I am using this number in Nigeria, and I rely on this WhatsApp account for my communication. I kindly request your support to help me successfully verify this number and restore access to my WhatsApp account as soon as possible.