You should apply the TN at the land border at after hour time. If you go ater hour, I guess they cannot contact the company after hour.
Please don't use this job offer to apply again, just in case you will be banned not allow to apply for TN again for 5 years . I saw someone has the issue before.
http://web.wenxuecity.com/BBSView.php?SubID=immigration&MsgID=466789
"並且說由於我是第二次被收,所以我五年內不得申請TN。隻能申請H1B"
http://web.wenxuecity.com/BBSView.php?SubID=law&MsgID=89578