not getting codes when sent to phone

I have been getting emails from Apple saying that someone was logging into my account from a browser I do not use. So I logged into my Apple account to change my password. When I logged in I was asked to answer my security questions, when answered I was told they were wrong, so I tried to reset my security questions. Apple sent a security code to my phone so I can change my questions, but after numerous attempts I am not getting the codes sent to my phone. The number is correct... and that's the only option its giving me, its not allowing me to send the codes to my rescue email. How do I change my security questions if I can't receive the code on my phone?