for all of you with the same problem, theres a easy way to fix it. (i had the same problem yesterday):
1. install bluestacks
2. download whatsapp for android from the official whatsapp-site
3. install whatsapp in bluestacks
4. type in your number and countrycode and after ~10 minutes you will get for sure a sms with the code
5. close bluestacs
6. type in the code manually in wazapp
7. enjoy

hope i could help you guys :P