Called me asking basic questions then asked me to reply to his email acknowledging that he called and to send my resume and last 4 digits of SSN. Since I was busy, I could not get around to it right away and he called a few minutes later asking for my full name. Then called another 2-3 times asking me to email him back. The email asked me not to submit another application to the hiring company. I was suspicious and never replied. He called again the next day.