Student Visa (F1, F2, M1, M2)

I was on F2 Status in USA. I have applied universities for MS in Computer Science Program and received I -20 from university for fall 2016 semester. After then i have applied for change of status from F2 to F1 status. I got the approval for F1 Status from USCIS on September 21, 2016.

i meet with my college international advisor for registration for fall 2016 but she told me its too late for registration cz class has started from September 07, 2016. She told me to contact with Department and registration office and meet with dean and registration office but unfortunately both guys does not allow me for registration.

so i didn't registration for fall 2016. My F1 status is effective from September 21, 2016 . Now i can't attend to college for fail to registration. What would be my F1 status.

my status will be invalid since i can't attend class. Right?

Kindly help me out about this issues. What i have to do right now ?
How many options i have to do valid my status ?

Thanks