WhatsApp Phone Number Verification Keeps Failing on Samsung Galaxy A05

I am using WhatsApp on a Samsung Galaxy A05 with the phone number +2637756947** in Zimbabwe, and for the past two days, I have been unable to complete the phone number verification process. Each time I try to verify, the process fails despite following the on-screen instructions, and at times, I receive a message that the number cannot be used, without any clear explanation. I have already tried all the suggested methods, including reinstalling the application, switching between SMS and phone call verification, and repeating the process multiple times, but the problem continues, and my number still cannot be activated. Some time ago, this number was once banned, but that issue was resolved, and since then, I have been using WhatsApp normally until this recent problem started. I am using this as a normal prepaid line without any special contract, and I rely on WhatsApp for my daily communication. I kindly request that my number +2637756947** be checked and that any possible restrictions or blocks be reviewed and removed so that my WhatsApp account can be activated again and I can verify my number without further errors.