Hi Veronica,
I understand that you are trying to verify your Microsoft Account and has requested for a verification code via your registered email address. But, you have never received a verification code from Microsoft and you have been waiting for it for the last 3 weeks. I would suggest you to refer to the section: “I am having problems receiving or using a security code” from this link:
http://windows.microsoft.com/en-US/windows-live/id-support
If you still do not get the code, then please get in touch with the Microsoft Chat Support from this link:
Hope this is helpful. If you need any further assistance with Windows Operating System, please post your query on Microsoft Community Forums and we’ll be glad to assist you with it.