It's frustrating when you encounter issues like this with WhatsApp. Since you've already contacted WhatsApp support multiple times and haven't received a satisfactory response, here are some additional steps you can try to resolve the issue:
Clear App Data/Cache: Sometimes, app data or cache can cause issues. Try clearing the app data and cache for WhatsApp on your device. You can do this through your device's settings (Settings > Apps > WhatsApp > Storage > Clear Data/Clear Cache).
Reinstall WhatsApp: Uninstall WhatsApp from your device and then reinstall it from the app store. This can help reset any configuration issues.
Use a Different Device: If possible, try using a different mobile device to register your new number. This can help determine if the issue is specific to your device.
Try a Different Number: You might want to try registering a different mobile number (if you have access to one) to see if the issue persists. This can help identify if the problem is with the specific number or with WhatsApp.
Contact Your Mobile Provider: Reach out to your mobile service provider and inquire if there are any restrictions or issues with your new number. They might be able to provide insights or assistance.
Check for WhatsApp Updates: Make sure you have the latest version of WhatsApp installed on your device. Outdated versions can sometimes have compatibility issues.
Wait and Retry: Sometimes, issues like this can resolve themselves over time. You might want to wait for a few days or weeks and then try registering the number again.
Reach Out to WhatsApp Again: Continue reaching out to WhatsApp support, explaining the issue in detail. If you receive automated responses, try to find a way to escalate the issue or request assistance from a human support representative.
Consider Alternative Messaging Apps: While you work on resolving the issue with WhatsApp, you might want to consider using alternative messaging apps to stay connected with your contacts.
If none of these steps resolve the problem, it might be a specific issue related to your mobile number or area code. In that case, contacting your mobile service provider and asking for their assistance could be beneficial.